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Gemstone Treatments

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DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Abalone (Shell) 3-4 no treatment n/a n/a n/a n/a Very soft, scratches easily, avoid all chemicals. Use damp cloth to clean.
3-4 dyed to add color commonly Detectable by qualified Gemologist fair
3-4 stabilized prevent porosity occasionally fair
Agate (Chalcedony) 6.5 no treatment n/a n/a n/a n/a Normalcare
6.5 bleached/dyed/ stained to alter color commonly Detectable by qualified Gemologist good to excellent Avoid sudden temperature changes, chemicals including purfumes and hairspray; and ultrasonic cleaners.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Amazonite (Feldspar) 6.5 no treatment n/a n/a n/a n/a Avoid harsh chemicals, heat, sonic and ultrasonic cleaning. Use mild soap and damp cloth.
6.5 irradiation to alter color rarely Undetectable very good
6.5 heated to improve color occasionally very good
6.5 dyed to improve color occasionally Detectable by qualified Gemologist very good
6.5 impregnated with colorless wax or oil to improve overall appearance and luster occasionally good to fair
6.5 impregnated with hardening agents or plastic to improve appearance and durability occasionally very good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Amber 2-2.5 no treatment n/a n/a n/a n/a Very soft, scratches easily, avoid harsh chemicals, heat, sonic and ultrasonic cleaning. Use damp cloth with mild soap to clean.
2-2.5 heat/Pressure to improve clarity and darken color frequently Detectable by qualified Gemologist very good
2-2.5 dyed/stained to alter color rarely variable
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Amblygonite 5.5-6 no treatment n/a n/a n/a n/a Soft stone, can be brittle. Avoid steamer and ultrasonic cleaners.
5.5-6 irradiated to alter color occasionally Detectable only with an internationally accredited laboratory good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Amethyst (Quartz) 7 no treatment n/a n/a n/a n/a Avoid extreme heat. Use mild soap and soft cloth to clean.
7 heated/irradiated to improve color occasionally Undetectable excellent
7 surface coated to improve color rarely Detectable by qualified Gemologist poor
7 quench-crakled to allow penetration of dyes. occasionally Undetectable excellent
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Ametrine (Quartz) 7 no treatment n/a n/a n/a n/a Avoid extreme heat or thermal shock. 
7 heated to improve color occasionally Undetectable excellent
7 surface coated to improve color rarely Detectable by qualified Gemologist poor
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Ammolite (Ammonite) 3.5-4 no treatment n/a n/a n/a n/a Avoid harsh chemicals (solvents), steamer and ultrasonic cleaners.
3.5-4 impregnation/stabilize to improve durability commonly Detectable by qualified Gemologist good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Ammonite (Ammonite) 3.5-4 lacquer coating to improve durability commonly Detectable by qualified Gemologist good Avoid harsh chemicals (solvents), steamer and ultrasonic cleaners.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Andalusite 7-7.5 no treatment n/a n/a n/a n/a Normal care, avoid steamers.
7-7.5 heated to improve color occasionally Undetectable excellent
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Apatite no treatment n/a n/a n/a n/a Moderately soft, scratches easily, avoid harsh chemicals, heat, sonic and ultrasonic cleaning.
5 heated to improve color  frequently Detectable by qualified Gemologist with use of equipment good
5 irradiated to improve color  occasionally Detectable only with an internationally accredited laboratory good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Aquamarine (Beryl) 7.5-8 no treatment n/a n/a n/a n/a Normal care
7.5-8 heated to improve color almost always not detectable excellent
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Aventurine Quartz (Quartzite) 6.5 no treatment n/a n/a n/a n/a Normal care
6.5 dyed to improve color often Detectable by qualified Gemologist good to excellent Avoid abrasives, ultrasonic cleaners, and heat.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Azurite 3.5-4 no treatment n/a n/a n/a n/a Very soft, scratches easily, avoid all chemicals and abrasives. Use damp cloth to clean.
3.5-4 impregnation to improve appearance/ durability occasionally Detectable by qualified Gemologist with use of equipment fair to good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Azurmalachite 3.5-4 no treatment n/a n/a n/a n/a Very soft, scratches easily, avoid abrasives, ultra sonic, solvents and heat. Use damp cloth to clean.
3.5-4 impregnation to improve polish/ durability rarely Detectable by qualified Gemologist good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Banded Agate (Chalcedony) 6.5 no treatment n/a n/a n/a n/a Normal care
6.5 dyed/stained to alter color commonly Detectable by qualified Gemologist   excellent
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Benitoite (Bastnasite) 4-4.5 not known to be treated n/a n/a n/a n/a Avoid steamers and ultrasonic cleaners.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Bixbite (Beryl) 7.5-8 oiled/resin infused to improve clarity and appearance commonly Detectable by qualified Gemologist with use of equipment fair to good Avoid ultrasonic cleaners, and harsh chemicals.
7.5-8 Opticon/Excel to improve clarity and appearance sometimes Detectable only with an internationally accredited laboratory verygood
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Black Star Diopside 5.5-6 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Bloodstone (Chalcedony) 6-6.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Carnelian (Chalcedony) 6.5 heated to improve color usually Undetectable excellent Normal care
6.5 dyed/stained to alter color often Detectable by qualified Gemologist   good to excellent  Avoid harsh chemicals, acetone and ultrasonic cleaners.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Cat's Eye Tourmaline 7-7.5 no treatment n/a n/a n/a n/a Normal care
7-7.5 acid treatment to improve appearance occasionally Undetectable good
7-7.5 oiled/resin infused to improve clarity occasionally Detectable by qualified Gemologist good Avoid steamer and ultra sonic cleaners.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Chalcedony 6.5 no treatment n/a n/a n/a n/a Normal care
6.5 heated to improve color often Detectable only with an internationally accredited laboratory good
6.5 dyed to alter/improve color often Detectable by qualified Gemologist with use of equipment good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Chrome Diopside 5.5-6 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Chrome Tourmaline 7-7.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Chrysocolla (Chalcedony) 2-6 not known to be treated n/a n/a n/a n/a Very soft, scratches easily, avoid all chemicals. Use damp cloth to clean.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Chrysoprase (Chalcedony) 6.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Citrine (Quartz) 7 no treatment  n/a n/a n/a n/a Normal care
7 heated to alter color commonly Undetectable excellent
7 irradiated to mprove color commonly Undetectable good
7 dye to improve color commonly Detectable by qualified Gemologist good
7 surface coated to improve color rarely poor
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Color Change Garnet 7-7.5 not known to be treated n/a n/a n/a n/a Normal care
Copper Bearing Tourmaline 7-7.5 no treatment n/a n/a n/a n/a Normal care
7-7.5 heated to alter color occasionally Detectable only with an internationally accredited laboratory excellent
Coral 3-4 no treatment n/a n/a n/a n/a Avoid ultrasonic cleaners, steam and extreme heat.
3-4 bleaching to alter color commonly Detectable by qualified Gemologist good
3-4 impregnated waxed/oiled to improve appearance and luster frequently good
3-4 dyed/stained to alter color frequently good
3-4 assembled product to create coral effect from smaller stones frequently fair to good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Danburite 7-7.5 not known to be treated n/a n/a n/a n/a Avoid steamers and ultrasonic cleaners.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Demantoid Garnet 6.5 no treatment n/a n/a n/a n/a Normal care
6.5 low temperature(heat) to improve color occasionally Detectable only with an internationally accredited laboratory excellent
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Dendritic Agate 6.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Dendritic Quartz 7 no treatment n/a n/a n/a n/a Normal care
7 heated to alter color rarely Detectable by qualified Gemologist excellent
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Diamond (Brown or Champagne) 10 no treatment  n/a n/a n/a n/a Normal care
10 HPHT(high pressure, high temperature) to lighten or change color occasionally Detectable only with an internationally accredited laboratory good Avoid high temperature.
10 lasered bleached with acid to improve clarity often very good Normal care
10 fracture filled to improve clarity occasionally Detectable by qualified Gemologist with use of equipment fair to very good Avoid extreme heat, temperature changes, steaming, chemicals and ultrasonic cleaners.
10 coated to add or minimize color rarely Detectable only with an internationally accredited laboratory poor to good Color may be affected by polishing, recutting, ultrasonic cleaners, alcohol.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Diamond (Color range D-Z) 10 no treatment  n/a n/a n/a n/a Normal care
10 HPHT(high pressure, high temperature) to improve color occasionally Detectable only with an internationally accredited laboratory good Avoid high temperature.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Diamond (Yellow, Pink,Black, Blue, Green) 10 no treatment n/a n/a n/a n/a Normal care
10 HPHT(high pressure, high temperature) to improve color  occasionally Detectable only with an internationally accredited laboratory good Avoid high temperature.
10 lasered filled to improve clarity occasionally very good Normal care
10 irradiated to create color often very good to excellent
10 fracture filled to improve clarity sometimes fair to very good Avoid extreme heat, temperature changes, steaming, chemicals and ultrasonic cleaners.
10 coated to add color sometimes poor to good Color may be affected by polishing, recutting, ultrasonic cleaners, alcohol.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Diaspore 6.5-7 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Diopside 5.5-6 not known to be treated n/a n/a n/a n/a Heat sensitive, do not expose to harsh chemicals.Do not use ultrasonic cleaner.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Dravite Tourmaline 7-7.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Druzy Quartz 7 no treatment n/a n/a n/a n/a Normal care
7 CVD to produce color frequently Detectable by qualified Gemologist with use of equipment very good Avoid abrasion.
7 heated to improve color occasionally excellent Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Emerald (Beryl) 7.5-8 no treatment  n/a extremely rare Detectable by qualified Gemologist with use of equipment n/a Normal care
7.5-8 dyed/stained to alter color occasionally fair Avoid extreme heat, temperature changes, steamer, chemicals and ultrasonic cleaners.
7.5-8 fracture filled with oil/resin to improve clarity and appearance  almost always fair to good
7.5-8 fracture filled with hardened/resin to improve clarity and appearance  sometimes Detectable only with an internationally accredited laboratory fair to good
7.5-8 ExCel to improve clarity and appearance  sometimes very good Normal care
7.5-8 assembled to improve color and durability occasionally Detectable by a qualified Gemologist n/a Avoid heat, chemicals, steamers, and ultrasonic cleaners.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Euclase 7.5 no treatment n/a n/a n/a n/a Avoid steamer, ultrasonic cleaners and high heat.
7.5 irradiation to add color n/a Undetectable n/a
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Fire Agate 6.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Fire Opal 5.5-6 no treatment n/a n/a n/a n/a Avoid water, heat and solvents.
5.5-6 impregnated to improve stability and durability occasionally Detectable by qualified Gemologist good
5.5-6 dyed/stained to add color sometimes good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Fluorite 4 no treatment n/a n/a n/a n/a Very soft, scratches easily, avoid all chemicals. Use damp cloth to clean.
4 plastic or resin impregnation to improve durability rarely Detectable by a qualified Gemologist  n/a
4 heated to improve color commonly Undetectable good
4 irradiated to alter/improve color occasionally Undetectable good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Fossil   not known to be treated n/a n/a n/a n/a Normal care
  stabilized to improve durability commonly Detectable by a qualified Gemologist good Avoid steamers and ultrasonic cleaners.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Goshenite (Beryl) 7.5-8 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Heliodor (Beryl) 7.5-8 no treatment  n/a n/a n/a n/a Normal care
7.5-8 irradiation to improve color  commonly Undetectable stable Avoid high heat
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Hematite 5.5-6.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Hemimorphite 4.5-5 not known to be treated n/a n/a nza n/a Moderately soft, avoid ultrasonic cleaners and steamers.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Hessonite Garnet 7-7.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Hiddenite (Spodumene) 6.5-7 no treatment n/a n/a n/a n/a Wear with care???
6.5-7 irradiated to create color rarely Undetectable poor
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Howlite - White 3-3.5 dyeing to alter color commonly Detectable by a qualified Gemologist good Normal care
3-3.5 impregnated to improve luster occasionally good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Idocrase 6.5 not known to be treated n/a n/a n/a n/a Normal care. Avoid ultrasonic cleaners and steamers.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Imperial Topaz 8 no treatment n/a n/a n/a n/a Normal care
8 heated to improve color usually Detectable only with an internationally accredited laboratory variable
8 irradiated to improve color sometimes variable Avoid heat and strong light.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Indicolite Tourmaline 7.7.5 no treatment n/a n/a n/a n/a Normal care
7-7.5 heated to improve color commonly Detectable only with an internationally accredited laboratory excellent
7-7.5 oiled/resin infused to improve appearance occasionally fair to good Avoid steamer and ultra sonic cleaners.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Iolite 7-7.5 not known to be treated n/a n/a n/a n/a Avoid thermal shock, ultrasonic cleaners and acids can damage.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Ivory 2-3 no treatment  n/a n/a n/a n/a Very soft, scratches easily may discolor with time. Discoloration is due to porosity/absorption of body oils or other substances from wearing. Avoid chemicals and ultrasonic cleaners. Requires gentle handling.
2-3 bleached to improve color commonly n/a good
2-3 dyed/stained to alter color or to look aged often n/a good
2-3 impregnated to minimize porosity occasionally n/a good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Jadeite Jade - Jadeite/Omphacite 6.5-7 no treatment n/a n/a n/a n/a Avoid heat, harsh chemicals, and ultrasonic cleaners.
6.5-7 heated to alter color n/a Undetectable excellent
6.5-7 waxed/oiled to improve appearance commonly Detectable only with an internationally accredited laboratory good
6.5-7 Bleached/impregnated to improve appearance frequently good Avoid harsh chemicals and ultrasonic cleaners.
6.5-7 dyed/stained to add color often good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Jasper 6-6.5 no treatment n/a n/a n/a n/a Avoid chemicals, steamer, and ultrasonic cleaners
6-6.5 dyed to add color occasionally Detectable by qualified Gemologist fair
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Kunzite (Spodumene) 6.5-7 no treatment n/a n/a n/a n/a Fading will occur if stone is exposed to prolonged exposure to light, especially UV and sunlight.
6.5-7 irradiated to improve color n/a Undetectable fair to good
6.5-7 heated to improve color commonly Detectable only with an internationally accredited laboratory fair
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Kyanite 5 & 7 no treatment n/a n/a n/a n/a Moderately soft, scratches easily. Avoid ultrasonic cleaners and steamers.
5 & 7 heated to alter color rarely Detectable only with an internationally accredited laboratory n/a
5 & 7 oiled/resin infused to improve clarity occasionally Detectable by qualified Gemologist fair
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Labradorite (Feldspar -plagioclase) 6-6.5 not known to be treated n/a n/a n/a n/a Avoid steamers and ultrasonic cleaners.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Labradorite/Andesine 6-6.5 diffused to add color occasionally Detectable only with an internationally accredited laboratory very good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Lapis Lazuli 5-6 no treatment  n/a n/a n/a n/a Avoid exposure to acids, heat, steamer and ultrasonic cleaners.
5-6 waxed/oiled to improve appearance commonly Detectable by qualified Gemologist fair
5-6 dyed/stained to improve color commonly poor to good
5-6 coating/ impregnation to improve appearance commonly fair
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Larimar 4.5-5 not known to be treated n/a n/a n/a n/a Moderately soft scratches easily, avoid steamer and ultrasonic cleaners.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Lazulite 5-6 not known to be treated n/a n/a n/a n/a Avoid chemicals, steamer, and ultrasonic cleaners.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Malachite 3.5-4 no treatment n/a n/a n/a n/a Very soft, scratches easily. Avoid chemicals, heat, steamer, and ultrasonic cleaners.
3.5-4 coated with colorless wax to improve appearance occasionally Detectable by qualified Gemologist fair
3.5-4 impregnated with plastic to improve appearance and durability often good
3.5-4 dyed to improve color uniformity occasionally good
3.5-4 reconstituted to improve color uniformity occasionally good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Malaya Garnet 7-7.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Mali Garnet 6.5-7 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Marcasite 6-6.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Matrix Opal 6 no treatment n/a n/a n/a n/a Normal care
6 oiled/resin infused to improve appearance and clarity occasionally Detectable by qualified Gemologist fair Avoid heat, chemicals, ultrasonic cleaners, and repolishing.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Maw Sit Sit 6-7 not known to be treated n/a n/a n/a n/a Avoid ultrasonic cleaners and steamers.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Meteorite n/a no treatment n/a n/a n/a n/a Normal care
n/a sealed to prevent rusting commonly n/a good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Moldavite (Natural Glass) 5-5.5 not known to be treated n/a n/a n/a n/a Avoid thermal shock.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Moonstone (Feldspar - orthoclase) 6-6.5 not known to be treated n/a n/a n/a n/a Avoid ultrasonic cleaners and steamers.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Morganite (Beryl) 7.5-8 no treatment n/a n/a n/a n/a Normal care
7.5-8 heated to improve color  commonly Detectable only with an internationally accredited laboratory excellent
7.5-8 irradiated to produce color commonly good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Mother of Pearl (Shell) 3 no treatment n/a n/a n/a n/a Very soft and porous, avoid heat, chemicals, and ultrasonic cleaners.
3 dyed/stained to alter color commonly Detectable by qualified Gemologist fair to good
3 stabilized toreduce porosity, to stabilized stone sometimes fair to good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Nephirte 6-6.5 no treatment n/a n/a n/a n/a Normal care
6-6.5 impregnated/ waxed to improve appearance commonly Detectable by qualified Gemologist with use of equipment fair Avoid harsh chemicals and ultrasonic cleaners.
6-6.5 dyed/stained to add color rarely Detectable only with an internationally accredited laboratory unknown
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Onyx (Chalcedony) 6.5 dyed/stained to alter color almost always Detectable by qualified Gemologist good Normal care
6.5 irradiated to darken color occasionally excellent Normal care 
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Opal Doublet 6 assembled product  to improve color and/or durability always Merged cell not sure what should be here. n/a Avoid heat, chemicals, ultrasonic cleaners, and repolishing.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Opal -Crystal/Black 5.5-6 no treatment n/a n/a n/a n/a Avoid recutting  ???
5.5-6 sugar to improve color rarely Detectable by qualified Gemologist good
5.5-6 smoke to improve color rarely good
5.5-6 dye to improve color rarely good Avoid heat, chemicals, ultrasonic cleaners, and repolishing.
5.5-6 impregnation to improve stability rarely Detectable only with an internationally accredited laboratory good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Pearl 3-4 no treatment n/a n/a n/a n/a Avoid cosmetics, perfumes, hairsprays, heat, household chemicals, steamer, and ultrasonic cleaners.
3-4 bleached to whiten and remove discoloration usually Undetectable excellent
3-4 dyed/stained to add color commonly Detectable by qualified Gemologist good
3-4 irradiated to create color occasionally Detectable only with an internationally accredited laboratory very good
3-4 coated to even color, improve luster often Detectable by qualified Gemologist fair to good
3-4 heating to improve color often Detectable only with an internationally accredited laboratory very good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Peridot 6.5 no treatment  n/a n/a n/a n/a Avoid ultrasonic cleaners and steamers.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Pezzottaite 8 not known to be treated n/a n/a n/a n/a Normal care
8 fracture filled to improve clarity occasionally Detectable only with an internationally accredited laboratory good Avoid ultrasonic cleaners and steamers.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Phenakite 7.5-8 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Pietersite (Quartzite) 6.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Pink Opal 6 not known to be treated n/a n/a n/a n/a Avoid heat, chemicals, ultrasonic cleaners.
6 dyed to enhance color occasionally Detectable by qualified Gemologist fair to good Avoid thermal shock, steaming, chemicals, and ultrasonic cleaners.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Prasiolite (Quartz) 7 irradiated/annealed to alter color always Detectable by qualified Gemologist very good Avoid a jeweler's torch
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Prehnite 6-6.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Pyrite 6-6.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Pyrope Garnet 7-7.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Rhodochrosite 3.5-4.5 not known to be treated n/a n/a n/a n/a Very soft, easily scratched or chipped. Avoid steamer and ultrasonic cleaners.
3.5-4.5 fracture filled to improve clarity occasionally Detectable by qualified Gemologist with use of equipment good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Rhodolite Garnet 7-7.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Rhodonite 5.5-6.5 no treatment n/a n/a n/a n/a Normal care
5.5-6.5 dyed/stained to add color occasionally Detectable by qualified Gemologist poor
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Rock Crystal Quartz 7 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Rose Quartz 7 no treatment n/a n/a n/a n/a Normal care
7 dyed to add color commonly Detectable by qualified Gemologist good Avoid heat, temperature changes, steaming, chemicals, and ultrasonic cleaners.
7 surface coated to improve color rarely poor
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Rubellite Tourmaline 7-7.5 no treatment n/a n/a n/a n/a Normal care
7-7.5 heated to improve color occasionally Undetectable excellent
7-7.5 irradiated to create color commonly Undetectable excellent
7-7.5 oiled/resin infused to improve appearance occasionally Detectable only with an internationally accredited laboratory fair to good Avoid temperature changes, steaming, chemicals, and ultrasonic cleaners.
7-7.5 dyed/stained to alter color rarely Detectable by qualified Gemologist poor to fair
7-7.5 fracture filled to improve clarity occasionally Detectable only with an internationally accredited laboratory good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Ruby (Corundum) 9 no treatment (extremely rare) n/a n/a n/a n/a Normal care
9 heated to improve clarity and appearance  usually Detectable only with an internationally accredited laboratory excellent
9 filled/flux healed to improve clarity commonly Detectable by qualified Gemologist with use of equipment good to excellent
9 Berylium lattice diffusion to improve color occasionally Detectable only with an internationally accredited laboratory excellent
6-9 lead glass filled(fissure filled) toimprove clarity, fill cracks commonly Detectable by qualified Gemologist poor Avoidharsh chemicals, steam and ultrasonic cleaners.
9 surface diffusion to create asterism or color occasionally Detectable by qualified Gemologist with use of equipment good Avoid repolishing / recutting and scratching.
9 dyed/stained with colored oils or polymers to improve color and clarity  occasionally poor Avoid harsh chemicals, heat and ultrasonic cleaners.
9 Titanium diffusion to improve color rarely Detectable only with an internationally accredited laboratory excellent Avoid recutting
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Rutilated Quartz 7 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Sapphire (Corundum) 9 no treatment (rare) n/a n/a n/a n/a Normal care
9 heated to improve color and clarity  usually Detectable only with an internationally accredited laboratory excellent
9 Berylium lattice diffusion to alter color occasionally excellent
9 filled to improve color and clarity rarely good
9 dyed to improve color rarely Detectable by qualified Gemologist fair
9 Titanium diffusion to improve color rarely excellent Avoid recutting
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Scapolite 6-6.5 not known to be treated n/a n/a n/a n/a Normal care
6-6.5 irradiated to altercolor n/a Undetectable poor Avoid light.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Scheelite 4.5-5 not known to be treated n/a n/a n/a n/a Soft stone, easily scrathed, avoid ultrasonic cleaners and steamers.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Sillimanite 6-7.5 none known n/a n/a n/a n/a Avoid ultrasonic cleaners and steamers.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Smoky Quartz 7 not known to be treated n/a n/a n/a n/a Normal care
7 irradiated to create color usually Detectable by qualified Gemologist good
7 surface coated to improve color rarely poor
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Sodalite 5-6 no treatment n/a n/a n/a n/a Normal care
5-6 dyed/stained to alter color sometimes Detectable by qualified Gemologist with use of equipment fair Avoid ultrasonic cleaners and steamers.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Spessartite Garnet 7-7.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Sphalerite 3.5-4 no treatment n/a n/a n/a n/a Very soft stone, easily scratched. Avoid ultrasonic cleaners and steamers.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Sphene 5-5.5 no treatment n/a n/a n/a n/a Soft, and easily scratched. Avoid ultrasonic cleaners and steamers.
5.5.5 heated to create red or orange color rarely Detectable by qualified Gemologist good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Spinel 8 not known to be treated n/a n/a n/a n/a Normal care
8 heated to improve color and clarity rarely Detectable only with a internationally accredited laboratory excellent
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Sugilite 5.5-6.5 no treatment n/a n/a n/a n/a Normal care
5.5-6.5 dyed to improve color occasionally Detectable by qualified Gemologist good Avoid steamers, solvents, and ultrasonic cleaners.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Sunstone 6-6.5 not known to be treated n/a n/a n/a n/a Normal, gentle handling. Avoid ultrasonic cleaners.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Taaffeite 8-8.5 not known to be treated  n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Tanzanite (Zoisite) 6-7 heated to improve color almost always not detectable excellent Avoid ultrasonic cleaners and steamers.
6-7 coated to improve color rarely Detectable by qualified Gemologist with use of equipment poor to fair Avoid chemicals, steamer and ultrasonic.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Tiger Eye 7 no treatment n/a n/a n/a n/a Normal care
7 chemical bleaching with acid or bleaching agents to alter color occasionally Detectable by qualified Gemologist excellent
7 heated to alter color commonly Undetectable excellent
7 dye to improve color occasionally Detectable by qualified Gemologist with use of equipment excellent
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Topaz 8 no treatment n/a n/a n/a n/a Normal care
8 heated to improve color commonly not detectable good
8 irradiated to create color commonly Detectable only with an internationally accredited laboratory varies Avoid thermal shock.
8 CVD coated to add color occasionally Detectable by a qualified Gemologist fair to good Color may be affected by polishing, ultrasonic cleaners, and alcohol.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Triphane (Spodumene) 6.5-7 no treatment n/a n/a n/a n/a Fading will occur if stone is exposed to prolonged exposure to light, especially UV and sunlight.
6.5-7 irradiated to create color rarely Detectable only with an internationally accredited laboratory poor
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Triplite 5-5.5 not known to be treated n/a n/a n/a n/a Clean with distilled water avoid abrasives, acids, solvents, steamers, heat, and ultrasonic cleaners.
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Tsavorite Garnet 7-7.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Turquoise 5-6 impregnated/waxed/ oiled to improve color and luster commonly Detectable by qualified Gemologist poor to fair Avoid hot water, household chemicals, steamer and ultrasonic cleaners. Cosmetics and perspiration may discolor stone. 
5-6 dyed/stained & stabilized to improve color often Detectable only with an internationally accredited laboratory poor to very good
5-6 reconstructed to make larger pieces from powder and smaller pieces occasionally Detectable by qualified Gemologist very good
5-6 stabilized to improve durability and appearance commonly Detectable only with an internationally accredited laboratory very good
5-6 Zachary Process to improve durability and appearance proprietary process Detectable only with an internationally accredited laboratory very good
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Uvarovite "Druzy" Garnet 7-7.5 not known to be treated n/a n/a n/a n/a Normal care
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Watermelon Tourmaline 7-7.5 no treatment n/a n/a n/a n/a Normal care
7-7.5 heated to improve color rarely Detectable only with an internationally accredited laboratory excellent
DESCRIPTION (Family) HARDNESS ENHANCEMENT PURPOSE FREQUENCY DETECTION STABILITY/DURABILITY CARE & HANDLING
Zircon 6-7.5 no treatment n/a n/a n/a n/a Handle with care, scratches easily; avoid high heat, ultrasonic cleaner. Use mild soap and soft cloth to clean.
6-7.5 heated to improve color frequently Detectable only with an internationally accredited laboratory good

 

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