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Gemstones

Enhancement/Treatment

Special Care
Abalone Not enhanced Avoid chemicals, heat, and ultrasonics
Agate (Chalcedony) Commonly dyed and/or heat treated Avoid chemicals, heat and strong light
Alexandrite (Chrysoberyl) Not known to be enhanced  
Almandite (Garnet) Not known to be enhanced Avoid sudden temperature changes
Amazonite Occasionally impregnated with colorless wax, paraffin Avoid chemicals, heat, and ultrasonics
Amber Occasionally heat treated and/or rarely dyed Avoid chemicals, heat and ultrasonics
Amethyst (Quartz) Occasionally heat treated  
Ametrine Not enhanced  
Andalusite Not enhanced  
Andesine Various treatments Avoid chemicals, heat, strong light, and ultrasonics
Andradite Grossular (Garnet) Not known to be enhanced Avoid chemicals, heat and ultrasonics
Apatite Not known to be enhanced Avoid chemicals, heat and ultrasonics
Aquamarine Usually heat treated  
Aragonite Not known to be enhanced Avoid chemicals, heat and ultrasonics
Australian Opal Rarely impregnated with colorless wax/oil/resins Avoid chemicals, heat and ultrasonics
Aventurine Not known to be enhanced  
Azurite Occasionally coated and/or impregnated with colorless wax Avoid chemicals, heat and ultrasonics
Benitoite Not known to be enhanced Avoid chemicals, heat and ultrasonics
Beryl-Blue Always irradiated AVOID HEAT AND STRONG LIGHT
Beryl-Pink Commonly heat treated  
Beryl-Red Not enhanced  
Beryl-Yellow Usually irradiated Avoid heat and strong light
Beryl-Yellow/Green Not enhanced  
Bi-Color Quartz Not known to be enhanced  
Bi-Color Tourmaline Usually heat treated  
Black Diamond Occasionally heat treated and/or irradiated Avoid chemicals
Black Onyx Always dyed Avoid chemicals, heat, and strong light
Black Spinel Not Enhanced  
Black Star Diopside Not known to be enhanced Avoid chemicals, heat and ultrasonics
Black Star Sapphire Usually heat treated and/or occasionally dyed Avoid chemicals, heat and ultrasonics
Bloodstone (Chalcedony) Not enhanced  
Blue Agate Commonly dyed and/or heat treated Avoid chemicals
Blue Gold Stone Usually enhanced with various coatings Avoid chemicals, heat and ultrasonics
Blue Lace Agate Not enhanced  
Blue Sapphire Usually heat treated  
Blue Spinel Not enhanced  
Blue Star Sapphire Usually heat treated  
Blue Tiger Eye Occasionally bleached and/or dyed and/or heat treated Avoid chemicals
Blue Topaz Usually heat treated and/or irradiated  
Blue Zircon Occasionally heat treated Avoid chemicals
Botswana Agate Commonly dyed and/or heat treated Avoid chemicals
Boulder Opal Occasinally infused with unhardened colorless substance Avoid chemicals, heat and ultrasonics
Brown Gold Stone Usually enhanced with various coatings Avoid chemicals, heat and ultrasonics
Carnelian (Chalcedony) Usually heat treated Avoid chemicals, heat, and strong light
Cat's Eye Occasionally irradiated Avoid chemicals, heat and ultrasonics
Chalcedony-Agate Commonly dyed and/or heat treated Avoid chemicals, heat, and strong light
Chalcedony-Black Onyx Always dyed Avoid chemicals, heat, and strong light
Chalcedony-Blue Commonly dyed Avoid chemicals, heat, and strong light
Chalcedony-Carnelian Usually heat treated Avoid chemicals, heat, and strong light
Chalcedony-Green Usually dyed Avoid chemicals, heat, and strong light
Chalcedony-Jasper Occasionally dyed Avoid chemicals, heat, and strong light
Chalcedony-Orange Commonly dyed Avoid chemicals, heat, and strong light
Chameleon diamand Occasionally heat treated and/or irradiated Avoid chemicals and heat
Champagne Citrine Usually heat treated Avoid heat
Champagne Diamond Occasionally heat treated and/or irradiated Avoid chemicals and heat
Charoite Not known to be enhanced Avoid chemicals, heat and ultrasonics
Chrome Diopside Not enhanced Avoid sudden temperature changes and chemicals
Chrome Tourmaline Not enhanced Avoid heat and ultrasonics
Chrysoberyl Not enhanced  
Chrysocolla Not enhanced Avoid ultrasonics
Chrysoprase Not enhanced Avoid strong light
Citrine Usually heat treated Avoid heat
Color Change Garnet Not enhanced Avoid chemicals and heat
Color Change Sapphire Usually heat treated  
Coral Usually dyed and/or bleached to improve color Avoid chemicals, heat and ultrasonics
Cultured Pearl Usually bleached and/or occasionally dyed Avoid chemicals, cosmetics, and ultrasonics
Demantoid Garnet Not enhanced Avoid sudden temperature changes
Diamond-Colored Occasionally heat treated and/or irradiated Avoid chemicals, heat and ultrasonics
Diamond-Colorless Occasionally heat treated and/or irradiated Avoid chemicals, heat and ultrasonics
Diopside Not known to be enhanced  
Drusy Commonly dyed or treated Avoid chemicals
Emerald Usually treated with colorless oil, wax, or natural Avoid chemicals, heat and ultrasonics
Fire Agate Not enhanced  
Fluorite Commonly heat treated and/or rarely irradiated Avoid chemicals, heat and ultrasonics
Freshwater Pearl Occasionally bleached and/or dyed Avoid chemicals, heat and ultrasonics
Garnet Not known to be enhanced Avoid sudden temperature changes
Garnet-Almandite Not enhanced Avoid sudden temperature changes
Garnet-Demantoid Not enhanced Avoid sudden temperature changes
Garnet-Grossularite Not enhanced Avoid sudden temperature changes
Garnet-Pyrope Not enhanced Avoid sudden temperature changes
Garnet-Rhodolite Not enhanced Avoid sudden temperature changes
Garnet-Spessartite Not enhanced Avoid sudden temperature changes
Garnet-Tsavorite Not enhanced Avoid sudden temperature changes
Goldstone Usually enhanced with various coatings Avoid chemicals, heat and ultrasonics
Grape Garnet Not enhanced Avoid chemicals and heat
Green Agate Commonly dyed and/or heat treated Avoid chemicals
Green Bloodstone Commonly dyed Avoid chemicals, heat and ultrasonics
Green Quartz Usually heat treated Avoid chemicals, heat and ultrasonics
Green Sapphire Usually heat treated  
Green Tourmaline Commonly heat treated Avoid chemicals, heat and ultrasonics
Grey Agate Commonly dyed and/or heat treated Avoid chemicals
Grossular Garnet Not known to be enhanced Avoid sudden temperature changes
Hematite Not enhanced Avoid chemicals and heat
Hemimorphite Not enhanced
Hessonite (Grossular Garnet) Not enhanced Avoid chemicals and heat
Howlite Occasionally dyed Avoid chemicals, heat and ultrasonics
Imperial Jade Commonly dyed and/or heat treated Avoid chemicals and heat
Imperial Topaz Commonly heat treated and/or irradiated Avoid chemicals and heat
Indicloite (Tourmaline) Commonly heat treated Avoid chemicals, heat and ultrasonics
Iolite Not enhanced Avoid chemicals, heat and ultrasonics
Jade (Green, White, and Purple) Commonly bleached and/or dyed Avoid chemicals, strong light, and ultrasonics
Jasper Occasionally dyed Avoid chemicals, heat, and strong light
Kunzite Commonly heat treated and/or irradiated Avoid strong light and ultrasonics
Labradorite Not known to be enhanced Avoid chemicals, heat and ultrasonics
Lapis LazuliI Commonly dyed or impregnated with colorless wax/oil Avoid chemicals and ultrasonics
Leopard Skin Jasper Not enhanced  
Lilas Quartz Occasionally heat treated Avoid chemicals and heat
London Blue Topaz Usually heat treated and/or irradiated  
Mabe Pearl Commonly bleached and/or dyed Avoid chemicals, heat and ultrasonics
Madeira Citrine Not known to be enhanced Avoid heat
Malachite Occasionally coated with colorless wax Avoid chemicals, heat and ultrasonics
Malaya Garnet Not enhanced Avoid heat
Mandarin Garnet Not enhanced Avoid heat
Marcasite Not enhanced Avoid chemicals and heat
Mawsitsit Not known to be enhanced Avoid chemicals, heat and ultrasonics
Mexican Black Opal Rarely impregnated with oil/wax and resins Avoid chemicals, heat and ultrasonics
Mexican Cherry Opal Not enhanced Avoid chemicals, heat and ultrasonics
Mexican Fire Opal Not enhanced Avoid chemicals, heat and ultrasonics
Mocha Zircon Occasionally heat treated Avoid chemicals
Moldavite (Tektite) Not enhanced Avoid chemicals and heat
Moonstone Not enhanced  
Morganite (Beryl) Commonly heat treated  
Moss Agate Occasionally dyed and/or heat treated Avoid chemicals
Mother of Pearl Commonly dyed Avoid chemicals, heat and ultrasonics
Mozambique Garnet Not enhanced  
Mystic Topaz Always enhanced with various coatings Avoid chemicals, heat and ultrasonics
New Jade Commonly dyed Avoid chemicals, heat and ultrasonics
Obsidian Not enhanced Avoid chemicals and heat
Onyx (Chalcedony) Black and colored onyx is always dyed Avoid chemicals
Opal Rarely impregnated with colorless wax/oil/resins Avoid chemicals, heat and ultrasonics
Opal Doublet Rarely impregnated with colorless wax/oil/resins Avoid chemicals, heat and ultrasonics
Opal Triplet Covered with colorless quartz Avoid chemicals, heat and ultrasonics
Orange Chalcedony Not known to be enhanced  
Orange Sapphire Usually heat treated  
Ouro Verde Always irradiated  
Padparadscha (Sapphire) Usually heat treated  
Paraiba Tourmaline Commonly heat treated Avoid chemicals, heat and ultrasonics
Pearl Commonly bleached and/or rarely dyed Avoid chemicals, cosmetics, and ultrasonics
Peridot Rarely treated with colorless oil/wax or natural Avoid sudden temperature changes, chemicals, and ultrasonics
Peruvian Blue Opal Not known to be enhanced Avoid chemicals, heat and ultrasonics
Pink Sapphire Usually heat treated  
Pink Tourmaline Occasionally heat treated Avoid chemicals, heat and ultrasonics
Precious Topaz Occasionally heat treated and/or irradiated Avoid chemicals, heat and ultrasonics
Purple Jade Commonly treated wtih a two-step bleaching and polish Avoid ultrasonics
Purple Sapphire Usually heat treated
Pyrite Not enhanced Avoid chemicals and heat
Pyrope Garnet Not enhanced Avoid sudden temperature changes
Quartz Occasionally dyed and/or heat treated and/or irradiated Avoid chemicals
Red Agate Commonly dyed and/or heat treated Avoid chemicals
Red Labradorite Various treatments Avoid chemicals, heat, strong light, and ultrasonics

Red Spinel

 Not known to be enhanced  
Rhodochrosite Not enhanced Avoid chemicals, heat and ultrasonics
Rhodolite Garnet Not enhanced Avoid sudden temperature changes
Rose De France Occasionally heat treated Avoid chemicals, heat and ultrasonics
Rose Quartz Not enhanced Avoid chemicals
Rubellite (Tourmaline) Occasionally heat treated Avoid chemicals, heat and ultrasonics
Ruby Usually heat treated Avoid chemicals
Rutilated Quartz Not enhanced Avoid chemicals, heat and ultrasonics
Sapphire (Corundum) Usually heat treated  
Serpentine Commonly dyed and/or impregnated with colorless wax Avoid ultrasonics
Sky Blue Topaz Usually heat treated and/or usually irradiated Avoid heat and strong light
Smoky Quartz Always irradiation of colorless quartz  
Snake Skin Jasper Not enhanced  
Snowflake Obsidian Not enhanced Avoid chemicals and heat
Sodalite Rarely dyed Avoid chemicals and heat
South Sea Pearl Occasionally bleached and/or dyed Avoid chemicals, heat and ultrasonics
Spessartite Garnet Not enhanced Avoid sudden temperature changes
Sphene Not known to be enhanced Avoid chemicals, heat and ultrasonics
Spinel Not enhanced Avoid chemicals, heat and ultrasonics
Star Ruby Not known to be enhanced  
Sugilate Not enhanced Avoid chemicals, heat and ultrasonics
Sunstone Various treatments Avoid chemicals, heat and ultrasonics
Swiss Blue Topaz Usually heat treated and/or usually irradiated Avoid chemicals, heat and ultrasonics
Tahitian Pearl Occasionally bleached and/or dyed Avoid chemicals, heat and ultrasonics
Tanzanite Usually heat treated Avoid sudden temperature changes and ultrasonics
Tashmarine Not known to be enhanced
Teal Diamond Occasionally heat treated and/or irradiated Avoid heat, and ultrasonics
Tiger's Eye Occasionally bleached and/or dyed and/or heat treated Avoid heat and strong light
Topaz-Blue Usually heat treated and irradiated Avoid chemicals, heat and ultrasonics
Topaz-Brown Not enhanced Avoid chemicals, heat and ultrasonics
Topaz-Green Usually irradiated Avoid chemicals, heat and ultrasonics
Topaz-Pink Usually heat treated Avoid chemicals, heat and ultrasonics
Topaz-Yellow/Orange Occasionally irradiated Avoid chemicals, heat and ultrasonics
Tourmaline-Chrome Not enhanced Avoid heat and ultrasonics
Tourmaline-Green/Blue Commonly heat treated and/or irradiated Avoid chemicals, heat, strong light, ultrasonics
Tourmaline-Pink/Red/Purple Commonly heat treated and/or irradiated Avoid, chemicals, heat, strong light, and ultrasonics
Tourmaline-Yellow/Orange Rarely heat treated and/or irradiated Avoid chemicals, heat, strong light, and ultrasonics
Tsavorite Garnet Not enhanced Avoid sudden temperature changes
Turquoise Commonly impregnated wtih plastic, colorless oil Avoid chemicals, heat and ultrasonics
Umbalite Garnet Not enhanced Avoid sudden temperature changes
Unakite Not enhanced Avoid chemicals
Violet Quartz Occasionally heat treated Avoid chemicals, heat and ultrasonics
Violet Sapphire Usually heat treatead  
Water Sapphire (Iolite) Not enhanced Avoid chemicals, heat and ultrasonics
Watermelon Tourmaline Occasionally heat treated Avoid chemicals, heat and ultrasonics
White Quartz Occasionally dyed and/or heat treated and/or irradiated Avoid chemicals
White Sapphire Usually heat treated  
Yellow Agate Commonly dyed and/or heat treated Avoid chemicals
Yellow Onyx Commonly dyed and/or heat treated Avoid chemicals
Yellow Sapphire Usually heat treated and/or occasionally irradiated  
Zircon Occasionally heat treated Avoid chemicals

 

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