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Gem Colour/Variety Possible enhancements Gemstone care
Amber All colours Heating treatment to improve colour and clarity. Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Apatite None. Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Beryl Heliodor Irradiated to improve colour. Basic jewellery care.
Aquamarine, Morganite Heating treatment to improve colour and clarity. Basic jewellery care.
Emerald Infused with colourless substances to improve surface uniformity. Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Chalcedony Bloodstone, Blue Lace Agate, Chrysocolla, Chrysoprase, Jasper, Sardonyx, White None. Basic jewellery care.
Black, Blue and Green Dyed. Basic jewellery care.
Agate, Carnelian Heating treatment to improve colour. Basic jewellery care.
Charoite Coated with colourless substances to improve surface uniformity and durability. Do not use ultrasonic cleaning.
Chrysoberyl Alexandrite, Brown, Cat’s Eye, Cat’s Eye Alexandrite, Green, Yellow None. Basic jewellery care.
Corundum Ruby, Star Ruby Heating treatment to improve colour and clarity. Infused with colourless substances to improve colour and clarity. Basic jewellery care.
Blue Sapphire, Iridescent, Colourless, Green, Orange, Yellow,  Padparadscha, Pink, Violet Sapphires and Star Sapphire Heating treatment and/or irradiation to improve colour and clarity. Infused with colourless substances to improve colour and clarity. Basic jewellery care.
Diamond None. Basic jewellery care.
Feldspar Labradorite, Moonstone, Spectrolite, Sunstone None. Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Amazonite Coated with colourless substances to improve surface uniformity.
Fluorite Heating treatment to improve colour. Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Garnet Almandite, Colour Change, Andradite, Grossular, Hessonite, Malaya, Pyrope, Rhodolite, Spessartite, Tsavorite None. Avoid sudden temperature changes.
Iolite None. Do not use ultrasonic cleaning.
Jade Black, White Jadeite, Green and Lavender, Black and Green Nephrite Coated with colourless substances to improve surface uniformity. Do not use ultrasonic cleaning.
Kyanite Blue None. Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Lapis Lazuli Coated with colourless substances to improve surface uniformity and durability. Do not use ultrasonic cleaning. Avoid contact with cosmetics, hairspray, perfume or household chemicals.
Malachite Coated with colourless substances to improve surface uniformity and durability. Do not use ultrasonic cleaning. Avoid contact with cosmetics, hairspray, perfume or household chemicals.
Opal Black, Blue, Boulder, Cachalong, Chrysopal, Crystal, Fire, Opalite, Pink, Prase, White, Yellow Coated with colourless substances to improve surface uniformity and durability. Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Cultured Pearls Saltwater: Akoya, Mabe (assembled) Bleached and dyed to improve uniformity of colour. Have strands cleaned and re-strung annually if worn regularly. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Keshi, South Sea Golden, South Sea White, Tahitian Bleached and dyed to improve uniformity of colour. Covered to protect the natural organic material. Have strands cleaned and re-strung annually if worn regularly. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Freshwater Bleached and dyed to improve uniformity of colour. Have strands cleaned and re-strung annually if worn regularly. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Natural Pearls Freshwater, Saltwater Bleached and dyed to improve uniformity of colour. Have strands cleaned and re-strung annually if worn regularly. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Calcareous Concretions Conch, Melo Melo Polished to improve finish. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Peridot None. Avoid contact with cosmetics, hairspray, perfume or household chemicals. Avoid contact with chlorate water.
Prenite Coated with colourless substances to improve surface uniformity. Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Quartz Aventurine, Dumortierite, Pietersite, Quartzite, Rock Crystal, Rose, Rutilated, Tiger’s Eye, Tiger’s Iron, Tourmalinated None. Basic jewellery care.
Amethyst, Citrine, Prasiolite, Smokey Heating treatment to improve colour. Basic jewellery care.
Rhodochrosite Coated with colourless substances to improve surface uniformity. Do not use ultrasonic cleaning.
Rhodonite Coated with colourless substances to improve surface uniformity. Do not use ultrasonic cleaning.
Shell Mother of Pearl Dyed. Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Sodalite Coated with colourless substances to improve surface uniformity and durability. Do not use ultrasonic cleaning. Avoid contact with cosmetics, hairspray, perfume or household chemicals.
Spinel All colours None. Basic jewellery care.
Spodumene Kunzite Heating treatment and/or irradiation to improve colour. Do not use ultrasonic cleaning. Avoid direct sunlight.
Sugilite Coated with colourless substances to improve surface uniformity. Do not use ultrasonic cleaning. Avoid contact with household chemicals.
Topaz Imperial, Orange, Pink, Yellow Heating treatment and/or irradiation to improve colour. Basic jewellery care.
Tourmaline Chrome None. Do not use ultrasonic cleaning. Avoid sudden temperature changes.
Blue, Green, Indicolite, Paraiba, Yellow Heating treatment to improve colour and clarity. Do not use ultrasonic cleaning. Avoid sudden temperature changes.
Multicoloured, Pink, Purple, Rubellite, Watermelon Irradiated to improve colour. Do not use ultrasonic cleaning. Avoid sudden temperature changes.
Turchese Coated with colourless substances to improve surface uniformity and durability. Do not use ultrasonic cleaning. Avoid sudden temperature changes and contact with cosmetics, hairspray, perfume or household chemicals.
Unakite Coated with colourless substances to improve surface uniformity. Basic jewellery care.
Zircon All colours Heating treatment to improve colour. Do not use ultrasonic cleaning.
Zoisite Tanzanite Coated with colourless substances to improve surface uniformity. Do not use ultrasonic cleaning. Avoid sudden temperature changes.
Ruby in Zoisite Coated with colourless substances to improve surface uniformity. Do not use ultrasonic cleaning.
Thulite Coated with colourless substances to improve surface uniformity. Do not use ultrasonic cleaning.