|
Normal care
|
None
|
Agate (see Chalcedony)
|
|
Normal care
|
None
|
Alexandrite
|
|
Normal care but avoid sudden temperature changes
|
None
|
Almandite (Garnet)
|
|
Avoid chemicals, steam and ultrasonic cleaning
|
Occasionally heat- treated or dyed to deepen color
|
Amber
|
|
Normal care
|
Occasionally heat- treated to improve color
|
Amethyst (Quartz)
|
|
Normal care
|
None
|
Ametrine (Quartz)
|
|
Normal care
|
Rarely heat-treated to improve color
|
Andalusite
|
|
Avoid chemicals, steam and ultrasonic cleaning
|
None
|
Apatite
|
|
Normal care
|
Usually heat-treated to improve color
|
Aquamarine (Beryl)
|
|
Normal care
|
None
|
Aventurine (Quartz)
|
|
Avoid chemicals, steam and ultrasonic cleaning
|
Rarely filled with epoxy or resin for smoother surface
|
Azurite
|
|
Avoid chemicals, steam and ultrasonic cleaning
|
Rarely filled with epoxy or resin for smoother surface
|
Azurmalachite
|
|
Normal care but avoid sudden temperature changes
|
Usually irradiated and heated to produce blue color
|
Blue Topaz
|
|
Normal care but avoid excessive heat.
|
Commonly heated for color enhancement
|
Canary Aqua ™
|
|
Normal care
|
None
|
Cat's Eye
|
|
Normal care
|
Usually dyed or heat-treated to produce different colors
|
Chalcedony
|
|
Avoid chemicals and sudden temperature changes
|
None
|
Chrome Diopside
|
|
Normal care
|
Usually heat-treated to improve color
|
Citrine (Quartz)
|
|
Avoid chemicals, steam and ultrasonic cleaning
|
Usually dyed or bleached to improve color
|
Coral
|
|
Normal care but avoid sudden temperature changes
|
None
|
Demantoid (Garnet)
|
|
Normal care
|
None
|
Diamond - clear
|
|
Normal care
|
Usually heat-treated or irradiated for color
|
Diamond - colored
|
|
Avoid chemicals, steam and ultrasonic cleaning
|
Usually oiled to improve color
|
Emerald (Beryl)
|
|
Avoid chemicals, steam and ultrasonic cleaning
|
Usually heat teated or irradiated to improve color
|
Fluorite
|
|
Normal care but avoid sudden temperature changes
|
None
|
Garnet (also listed by type)
|
|
Normal care
|
Occasionally stabilized with plastic
|
Gaspeite
|
|
Normal care
|
None
|
Goshenite
|
|
Normal care
|
Irradiated for color enhancement
|
Heliodor
|
|
Normal care
|
None
|
Hematite
|
|
Normal care but avoid sudden temperature changes
|
None
|
Hessonite (Garnet)
|
|
Avoid steam and ultrasonic cleaning
|
Occasionally dyed to improve color and to emulate turquoise
|
Howlite
|
|
Normal care but avoid sudden temperature changes
|
Commonly heat-treated to impr
|
Indicolite (Tourmaline)
|
|
Normal care but avoid sudden temperature changes
|
None
|
Iolite
|
|
Normal care
|
Commonly dyed, heated, occasionally filled with wax for appearance
|
Jade
|
|
Normal care
|
Occasionally dyed to enhance color
|
Jasper
|
|
Avoid steam and ultrasonic cleaning
|
None
|
Jet
|
|
Normal care but avoid rough handling
|
None
|
Kornerupine
|
|
Avoid sudden temperature changes, rough handling and exposure to strong light
|
Usually irradiated to enhance color
|
Kunzite (Spodmene)
|
|
Avoid rough handling, steam and ultrasonic cleaning
|
None
|
Kyanite
|
|
Avoid rough handling, steam and ultrasonic cleaning
|
None
|
Labradorite
|
|
Avoid chemicals, steam and ultrasonic cleaning
|
Commonly dyed and paraffin-coated for color and shine
|
Lapis Lazulli
|
|
Normal care
|
None
|
Lepidolite
|
|
Avoid chemicals, steam and ultrasonic cleaning
|
Wax or epoxy occasionally added to cover small chips and to smooth surface
|
Malachite
|
|
Normal care
|
None
|
Mariposite
|
|
Normal care
|
None
|
Moldavite
|
|
Normal care
|
None
|
Moonstone
|
|
Normal care
|
Commonly heat-treated to enhance color
|
Morganite
(Beryl)
|
|
Avoid chemicals, steam and ultrasonic cleaning
|
Commonly dyed to produce colors
|
Mother of Pearl
|
|
Normal care
|
None
|
Muscovite
|
|
|
|
|
|
Normal care but avoid abrasives and harsh chemicals. These stones should not be recut.
|
The top is coated to enhance the color.
|
Mystic Topaz
|
|
Normal care
|
Commonly dyed
|
Onyx
(Chalcedony)
|
|
Avoid chemicals, steam and ultrasonic cleaning
|
To enhance appearance and durability, wax, oil or plastic may be added
|
Opal
|
|
Avoid chemicals (including hairspray and cosmetics), steam and ultrasonic cleaning
|
Commonly bleached or dyed for consistent color
|
Pearl
|
|
Avoid chemicals, steam and ultrasonic cleaning, sudden temperature changes
|
None
|
Peridot
|
|
Avoid rough handling, ultrasonic cleaning
|
None
|
Petalite
|
|
Normal care
|
None
|
Petrified Wood
(see Chalcedony)
|
|
Normal care
|
None
|
Pietersite
|
|
Normal care but avoid sudden temperature changes
|
None
|
Pyrope
(Garnet)
|
|
Avoid chemicals, steam and ultrasonic cleaning
|
Occasionally stabilized withplastic
|
Rainbow Calsilica
|
|
Avoid chemicals, rough handling, and excessive heat.
|
None
|
Rhodochrosite
|
|
Normal care but avoid sudden temperature changes
|
None
|
Rhodolite
(Garnet)
|
|
Normal care
|
None
|
Rhodonite
|
|
Normal care but avoid sudden temperature changes
|
None
|
Rosenite™
(Garnet)
|
|
Normal care but avoid sudden temperature changes
|
Commonly heat-treated or irriadiated to enhance color
|
Rubellite
(Tourmaline)
|
|
Normal care
|
Usually heat-treated to enhance color
|
Ruby
|
|
Normal care
|
None
|
Rutilated Quartz
|
|
Normal care
|
Usually heat-treated to enhance color
|
Sapphire
|
|
Avoid steam and ultrasonic cleaning, avoid exposure to strong light
|
Commonly irradiated for color enhancement
|
Scapolite
|
|
Avoid steam and ultrasonic cleaning
|
Commonly dyed or waxed to improve appearance or alter colors
|
Serpentine
|
|
Avoid chemicals, steam and ultrasonic cleaning
|
Commonly dyed to produce colors
|
Shell
|
|
Normal care
|
Occasionally heat-treated or irradiated to improve color
|
Smokey Quartz
|
|
Avoid chemicals, steam and ultrasonic cleaning
|
None
|
Sodalite
|
|
Normal care but avoid sudden temperature changes
|
None
|
Spessartite
(Garnet)
|
|
Avoid chemicals, sudden temperature changes, and rough handling
|
None
|
Sphene
|
|
Normal care
|
None
|
Spinel
|
|
Avoid steam and ultrasonic cleaning
|
None
|
Sugilite
|
|
Avoid chemicals, steam and ultrasonic cleaning
|
None
|
Sunstone
|
|
Avoid steam, ultrasonic cleaning and sudden temperature changes
|
Zoisite is routinely heat-treated to produce Tanzanite’s signature violet-blue color
|
Tanzanite
|
|
Normal care
|
None
|
Tiger Iron
|
|
Avoid sudden temperatures changes and strong chemicals
|
Commonly heat-treated, dyed or bleached to enhance color
|
Tiger's Eye
(Quartz)
|
|
Normal care but avoid sudden temperature changes
|
Usually heat-treated to create colors
|
Topaz
(other than blue)
|
|
Normal care but avoid sudden temperature changes
|
Green and blue commonly heat-treated to enhance color.
|
Tourmaline
|
|
Normal care but avoid sudden temperature changes
|
None
|
Tsvorite
(Garnet)
|
|
Avoid chemicals, steam and ultrasonic cleaning. Perspiration and cosmetics may alter color.
|
Commonlystabilized – infused with plastic to enhance durability and color
|
Turquoise
|
|
Avoid chemicals, steam and ultrasonic cleaning
|
None
|
Unakite
|
|
Avoid chemicals, steam and ultrasonic cleaning
|
None
|
Variscite
|
|
Normal care but avoid sudden temperature changes
|
Commonly heat-treated to enhance color
|
Verdelite
(Tourmaline)
|
|
Normal care
|
None
|
White Aqua™
(Beryl)
|
|
Normal care but avoid excessive heat
|
Commonly heated for color enhancement
|
Yellow Beryl
(Heliodor)
|
|
Avoid abrasives, rough wear and exposure to strong light.
|