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Gemstones

Treatments/benefits

Care instructions

Abalone gemstone

None

Avoid heat, household chemicals, steam, sudden temperature changes, ultrasonic cleaning

Agate gemstone (see Chalcedony)

Sometimes heat-treated and / or dyed to enhance bands in layers

Normal care

Alexandrite gemstone

None

Normal care

Almandite gemstone (see Garnet)

None

Avoid sudden temperature changes

Amazonite gemstone

Sometimes heat-treated or irradiated to enhance color; sometimes stabilized with a colorless wax, oil, plastic or hardening agent to enhance appearance

Avoid household chemicals, steam, ultrasonic cleaning

Amber gemstone

Sometimes heat-treated, dyed or surface-treated to deepen color; sometimes pressed/compressed with extreme pressure and heat to fuse together small pieces of natural amber

Avoid household chemicals, steam and ultrasonic cleaning

Amethyst gemstone (see Quartz)

Occasionally heat- treated to enhance color

Normal care

Ametrine gemstone (Quartz)

None

Normal care

Ammolite gemstone (Ammonite Shell)

Sometimes stabilized to increase durability and to improve appearance

Avoid heat, household chemicals, ultrasonic cleaning

Andalusite gemstone

Occasionally heat-treated to enhance color

Normal care

Apatite gemstone

None

Avoid household chemicals, steam, ultrasonic cleaning

Aquamarine gemstone (see Beryl)

Occasionally heat-treated to enhance color

Normal care

Aventurine gemstone (Quartz)

None

Normal care

Azurite gemstone

Occasionally filled with epoxy or resin to create smoother surface

Avoid household chemicals, steam and ultrasonic cleaning

Azurmalachite gemstone

Rarely filled with epoxy or resin for smoother surface

Avoid household chemicals, steam and ultrasonic cleaning

Beryl gemstone(also listed by type)

Occasionally dyed, heat treated, irradiated to improve color; usually oil-, wax- and/or resin-filled increase durability and to improve appearance

Avoid heat, household chemicals, steam, sudden temperature changes, ultrasonic cleaning

Bloodstone (Chalcedony)

None

Avoid household chemicals, steam and ultrasonic cleaning

Blue Topaz gemstone

Usually irradiated and heated to produce blue color

Avoid steam, sudden temperature changes, ultrasonic cleaning

Calcite gemstone

Dyed to enhance color; stabilized with colorless plastic to increase durability and to improve appearance

Avoid heat, household chemicals, steam, sudden temperature changes, ultrasonic cleaning

Carnelian gemstone (see Chalcedony)

Sometimes dyed and/or heat-treated to improve color

Avoid excessive heat

Cat's Eye effect

None

Normal care

Chalcedony gemstone (see Quartz)

Usually dyed and/or heat-treated to produce different colors

Normal care

Chrome Diopside gemstone

None

Avoid household chemicals, steam, sudden temperature changes, ultrasonic cleaning

Chrysoprase gemstone (see Chalcedony)

None

Avoid household chemicals, steam and ultrasonic cleaning

Chrysocolla gemstone

None

Avoid household chemicals, steam and ultrasonic cleaning

Citrine gemstone (Quartz)

Usually heat-treated or irradiated to improve color

Normal care

Coral gemstone

Usually dyed or bleached to enhance color; sometimes stabilized with colorless plastic increase durability and to improve appearance; sometimes stabilized and compressed under extreme pressure and heat to bind together small pieces of natural material into a larger whole

Avoid household chemicals, steam and ultrasonic cleaning

Corundum Gemstone (also listed by type)

Usually heat-treated, diffusion-treated or irradiated to enhance color; occasionally dyed, oiled, glass-filled to enhance clarity

Avoid heat, household cleaning solutions, ultrasonic cleaning and repairs; they can cause damage, as this treatment is not considered permanent or stable

Demantoid gemstone (see Garnet)

None

Avoid heat, household chemicals, steam, sudden temperature changes, ultrasonic cleaning

Diamond gemstone - clear

None

Normal care

Diamond gemstone - colored

Usually heat-treated or irradiated for color

Normal care

Drusy Quartz gemstone

coated and or dyed to enhance color

Avoid heat, household chemicals, re-polishing, steam, sudden temperature changes, ultrasonic cleaning

Emerald gemstone (see Beryl)

Usually oiled to improve color; usually oil-, wax and/or resin-filled to increase durability and/or to improve appearance

Avoid household chemicals, steam and ultrasonic cleaning

Fluorite gemstone

Usually heat treated or irradiated to enhance color

Avoid household chemicals, steam and ultrasonic cleaning

Garnet gemstone (also listed by type)

None

Avoid sudden temperature changes

Gaspeite gemstone

Occasionally stabilized with plastic/resin increase durability and to improve appearance

Normal care

Goshenite gemstone

None

Avoid sudden temperature changes

Grossularite gemstone (Garnet)

None

Avoid sudden temperature changes

Heliodor gemstone

Irradiated for color enhancement

Normal care

Hematite gemstone

None

Avoid sudden temperature changes

Hessonite gemstone (Garnet)

None

Avoid sudden temperature changes

Hiddenite gemstone (Spodumene)

Irradiated to enhance color

Avoid exposure to excessive light, rough handling, sudden temperature changes

Howlite gemstone

Sometimes dyed to enhance color and to simulate turquoise and other stones

Avoid steam and ultrasonic cleaning

Indicolite gemstone (Tourmaline)

Usually heat-treated to enhance color

Avoid exposure to excessive light, rough handling, sudden temperature changes

Iolite gemstone

None

Avoid sudden temperature changes

Ivory & Bone Gemstones

Usually bleached or dyed to enhance color; sometimes stabilized increase durability and to improve appearance

Avoid household chemicals and ultrasonic, may discolor in time

Jade gemstone

Usually dyed and/or heat-treated to enhance color; occasionally wax-coated to enhance appearance

Normal care

Jasper (Chalcedony) gemstone

Occasionally dyed to enhance color

Normal care

Jet gemstone

None

Avoid steam and ultrasonic cleaning

Kornerupine gemstone

None

Avoid rough handling, sudden temperature changes, stream, ultrasonic cleaning

Kunzite gemstone (see Spodumene)

Usually irradiated to enhance color

Avoid exposure to excessive light, rough handling, sudden temperature changes

Kyanite gemstone

Occasionally heated to enhance color

Avoid rough handling, steam and ultrasonic cleaning

Labradorite gemstone

None

Avoid rough handling, steam and ultrasonic cleaning

Lapis Lazuli gemstone

Usually dyed and wax-coated to enhance color and shine

Avoid household chemicals, steam and ultrasonic cleaning

Lepidolite Gemstone

None

Normal care

Malachite Gemstone

Occasionally infused with wax or epoxy to enhance durability and appearance, and to create smooth surface

Avoid household chemicals, steam and ultrasonic cleaning

Mammoth Gemstone (see Ivory)

Usually bleached, dyed and/or stabilized to improve color or increase durability and to improve appearance

Avoid household chemicals and ultrasonic, may discolor in time

Marcasite Gemstone

None

Avoid household chemicals, stem/heat, ultrasonic, sudden temperature changes

Mariposite Gemstone

None

Normal care

Moldavite Gemstone

None

Avoid sudden temperature changes

Moonstone Gemstone

None

Normal care

Morganite Gemstone (see Beryl)

Commonly heat-treated to enhance color

Normal care

Mother of Pearl gemstone

Usually bleached, dyed, irradiated and/or coated to produce colors

Avoid household chemicals, steam and ultrasonic cleaning

Muscovite gemstone

None

Normal care

Mystic Topaz gemstone

Surface-enhanced with a coating to enhance color

Avoid abrasive and harsh chemicals, do not re-cut stones

Obsidian gemstone

None

Avoid household chemicals, steam and ultrasonic cleaning

Onyx gemstone (see Chalcedony)

Usually dyed to enhance color

Normal care

Opal gemstone

Sometimes infused with wax, oil or plastic to enhance appearance and durability

Avoid household chemicals, steam and ultrasonic cleaning

Pearl gemstone

Usually bleached, dyed, irradiated and/or coated to enhance appearance

Avoid household chemicals (including hairspray and cosmetics), steam and ultrasonic cleaning

Peridot gemstone

Sometimes infused with oil, wax , resins and/or colorless hardened substance to enhance appearance

Avoid household chemicals, sudden temperature changes, steam, ultrasonic cleaning

Petalite gemstone

None

Avoid rough handling, ultrasonic cleaning

Petrified Wood gemstone (see Chalcedony)

None

Normal care

Pietersite gemstone

None

Normal care

Prasiolite gemstone (praziolite) (Quartz)

Usually heat-treated to enhance color

Avoid household chemicals, steam and ultrasonic cleaning

Prehnite gemstone

Occasionally stabilized increase durability and to improve appearance

Avoid household chemicals, steam and ultrasonic cleaning

Pyrope gemstone (Garnet)

None

Avoid sudden temperature changes

Quartz gemstone (also listed by type)

Usually dyed and/or heat-treated to produce different colors; sometimes surface-enhanced with a coating to enhance color

Avoid abrasives, harsh chemicals, steam, ultrasonic cleaning; surface enhanced-stones should not be re-cut

Quartzite gemstone

Sometimes stabilized with colorless resin increase durability and to improve appearance

Normal care

Rainbow Calsilica gemstone

Sometimes stabilized and compressed with a binding agent under extreme pressure and heat to bind together small pieces of natural material into a larger whole

Avoid household chemicals, steam and ultrasonic cleaning

Rhodochrosite gemstone

None

Avoid household chemicals, rough handling, and excessive heat.

Rhodolite gemstone (see Garnet)

None

Avoid sudden temperature changes

Rhodonite gemstone

None

Normal care

Rock Crystal Gemstone (Quartz )

None

Normal care

Rosenite™ gemstone (Garnet)

None

Avoid sudden temperature changes

Rubellite gemstone (see Tourmaline)

Usually heat-treated or irradiated to enhance color

Avoid sudden temperature changes

Ruby gemstone

Usually heat-treated, diffusion-treated and/or irradiated to enhance color; occasionally dyed, oiled, glass-filled to enhance clarity

Avoid heat, household cleaning solutions, ultrasonic cleaning, repairs; they can cause damage, as this treatment is not considered permanent or stable

Rutilated Quartz gemstone

None; needle-like rutiles are natural characteristics

Avoid heat, household chemicals, sudden temperature changes, steam, ultrasonic cleaning

Sardonyx gemstone (see Chalcedony)

Usually dyed to enhance color

Avoid household chemicals, stem/heat, ultrasonic, sudden temperature changes

Sapphire gemstone

Usually heat-treated, diffusion-treated and/or irradiated to enhance color; occasionally dyed, oiled, glass-filled to enhance clarity

Avoid heat, household cleaning solutions, ultrasonic cleaning and repairs; they can cause damage, as this treatment is not considered permanent or stable

Sard gemstone

Sometimes dyed and/or heat-treated to enhance color

Avoid excessive heat and light

Scapolite gemstone

Usually irradiated to enhance color

Avoid steam and ultrasonic cleaning, avoid exposure to strong light

Serpentine gemstone

Usually dyed or waxed to enhance appearance or to alter color

Avoid steam and ultrasonic cleaning

Shell gemstone

Usually dyed to produce colors

Avoid household chemicals, steam and ultrasonic cleaning

Smokey Quartz gemstone

Occasionally heat-treated or irradiated to enhance color

Avoid heat, household chemicals, sudden temperature changes, steam, ultrasonic cleaning

Sodalite gemstone

None

Avoid household chemicals, steam and ultrasonic cleaning

Spessartite gemstone (see Garnet)

None

Avoid sudden temperature changes

Sphene gemstone

None

Avoid household chemicals, sudden temperature changes, and rough handling

Spinel gemstone

None

Normal care

Spodumene Gemstone (Hiddenite) (Kunzite)

Irradiated to enhance color

Avoid exposure to excessive light, rough handling, sudden temperature changes

Sugilite gemstone

Occasionally dyed to enhance color

Avoid household chemicals, stem and ultrasonic cleaning

Sunstone gemstone

None

Avoid household chemicals, steam and ultrasonic cleaning

Tanzanite gemstone (see Zoisite)

Usually heat-treated to enhance color

Avoid steam, ultrasonic cleaning and sudden temperature changes

Tiger Iron gemstone

None

Normal care

Tiger's Eye gemstone (see Quartz)

Usually heat-treated, dyed or bleached to enhance color

Avoid harsh chemicals, sudden temperatures changes

Topaz gemstone (colors other than blue)

Usually heat-treated to produce different colors; sometimes surface-enhanced with a coating to enhance color

Avoid abrasives, harsh chemicals, sudden temperature changes, steam, ultrasonic cleaning; surface-enhanced stones should not be re-cut

Tourmaline gemstone

Green and blue tourmaline are usually heat-treated to enhance color; yellow and red tourmaline are usually irradiated to improve color

Avoid sudden temperature changes, ultrasonic cleaning and steamer

Tourmalinated Quartz gemstone (see Quartz)

None; needle-like quartz rutiles are natural characteristics

Avoid household chemicals, steam and ultrasonic cleaning

Tsvorite gemstone (see Garnet)

None

Avoid sudden temperature changes

Turquoise gemstone

Usually stabilized with plastic to enhance durability and color; sometimes stabilized and compressed with a binding agent under extreme pressure and heat to bind together small pieces of natural material into a larger whole

Avoid household chemicals, steam and ultrasonic cleaning. Perspiration and cosmetics may alter color.

Unakite gemstone

None

Avoid household chemicals, steam and ultrasonic cleaning

Variscite gemstone

None

Avoid household chemicals, steam and ultrasonic cleaning

Verdelite gemstone (Tourmaline)

Usually heat-treated to enhance color

Avoid sudden temperature changes, steam, ultrasonic cleaning

White Aqua™ gemstone (Beryl)

None

Normal care

Yellow Beryl gemstone (Heliodor)

Usually heat-treated to enhance color

Avoid sudden temperature changes, ultrasonic cleaning and steamer

Zircon gemstone

Usually heat-treated to create blue color

Avoid abrasives, exposure to excessive light, rough handling

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