Agate, Lake Superior
Usual Treatments - Dyeing
Hardness - 6.5 to 7
Major Sources - Minnesota, Iowa, Wisconsin, South & North Dakota
Alexandrite
Usual Treatments - None
Hardness - 8.5
Color Change
Major Sources - Brazil, Tanzania, Russia
Amethyst
Usual Treatments - Heat
Hardness - 7
Major sources - Africa, South America, Russia,
Mexico, Zambia
Ametrine
Usual Treatments - None
Hardness - 7
Major Source - Bolivia
Aquamarine
Usual Treatments - Heat
Hardness - 7.5 to 8
Major Sources - South America, Africa, China
Chalcedony
Usual Treatments - None
Hardness - 6.5 to 7
Major Sources - Blue: Africa
Lavender: United States
Citrine
Usual Treatments - Heat
Hardness 7
Major Sources - Brazil, Bolivia
Diamond, Colored
Both natural and treated colors are available
Hardness - 10
Major Sources - Canada, Russia, Australia
Diamond, White
Usual Treatments - None
Hardness - 10
Major Sources - Canada, Russia
Emerald
Usual Treatments - Oiling, Resin Infusion
Hardness - 7.5 to 8
Major Sources - Afghanistan, Columbia, Zambia, Brazil, Zimbabwe
Garnet
Usual Treatments - None
Hardness - 7 to 7.5
Major Sources - Africa, Sri Lanka, India, East
Africa, Australia, Brazil, United States
Garnet, Tsavorite
Usual Treatments - None
Hardness - 7 to 7.5
Major Sources - Sri Lanka, Kenya, Tanzania, Brazil,
India
Greenstone
Usual Treatments - None
Hardness - 7 to 7.5
Major Source - Michigan
Iolite
Usual Treatments - None
Hardness - 7 to 7.5
Major Sources - India, Tanzania, Brazil, Sri Lanka,
Madagascar, Namibia, Myanmar
Jade, Jadeite
Usual Treatments - Dyed (ours is untreated)
Hardness - 7
Major Sources - Burma, China
Jade, Nephrite
Usual Treatments - None
Hardness - 6.5
Major Sources - Taiwan, Canada, Australia, China,
New Zealand
Larimar
Usual Treatments - None
Hardness - 4.5 to 5
Major Source - Dominican Republic
Onyx
Usual Treatments - Dyeing
Hardness - 6.5 to 7
Major Sources - Brazil, Madagascar, Uruguay,
United States
Opal, Black
Usual Treatments - None
Hardness - 5 to 6.5
Major Source - Australia
Fire Opal
Usual Treatments - None
Hardness - 5 to 6.5
Major Source - Mexico
Opal, White
Usual Treatments - None
Hardness - 5 to 6.5
Major Source - Australia
Pearl, Akoya Cultured
Usual Treatments - Color Stabilization
Hardness - 2.5 to 4
Major Source - Japan
Pearl, Freshwater
Usual Treatments - Color Stabilization
Hardness - 2.5 to 4
Major Sources - China, Japan
Pearl, Mabe`
Usual Treatments - Color Stabilization
Hardness - 2.5 to 4
Major Sources - China, Japan
Pearl, Tahitian Cultured
Usual Treatments - Color Stabilization
Hardness - 2.5 to 4
Major Source - Tahiti
Peridot
Usual Treatments - None
Hardness - 6.5 to 7
Major Sources - United States, China, Australia,
Brazil, Myanmar, Kenya, Mexico, Sri Lanka
Ruby
Usual. Treatments - Heat
Hardness - 9
Major Sources - Thailand, Myanmar, Kampuchea, Sri Lanka, Kenya, India, Afghanistan, Pakistan, Tanzania, Madagascar
Sapphire, Blue
Usual Treatments - Heat
Hardness - 9
Major Sources - Australia, Thailand, Sri Lanka, India,
United States, Kenya, Tanzania, Myanmar, Kampuchea
Sapphire, Star
Usual Treatments - Heat Diffusion
Hardness - 9
Major Sources - Australia, Thailand, Sri Lanka,
United States, India, Tanzania, Kamduchea, Myanmar, Madagascar
Sapphire, Yellow
Usual Treatments - Heat Diffusion
Hardness - 9
Major Sources - Australia, Thailand, Sri Lanka,
United States, India, Tanzania, Kamduchea, Myanmar, Madagascar
Smoky Quartz
Usual Treatments - Heat, Impregnation
Hardness - 7
Major Sources - Brazil, Madagascar, Uruguay, Sri
Lanka, South Africa
Tanzanite
Usual Treatments - Heat
Hardness - 6 to 7
Major Source - Tanzania
Thomsonite
Usual Treatments - None
Hardness - 5 to 5.5
Major Source - Scotland, Arkansas, Colorado, Michigan, Minnesota, New Jersey, Oregon, Ontario, Nova Scotia, India, and Russia
Topaz, Blue
Usual Treatments - Radiation
Hardness - 8
Major Sources - Brazil, Nigeria, Australia,
Myanmar, Mexico, Namibia, Pakistan, Sri Lanka
Topaz,Color Fusion, Diffused
Mystic, Buick, Poppy, Ice Blue
Usual Treatments - Diffusion
Hardness - 8
Major Sources - Brazil, Nigeria, Australia, Myanmar, Mexico, Namibia, Pakistan, Sri Lanka
Topaz, Precious
Usual Treatments - None
Hardness - 8
Major Source - Brazil
Tourmaline, Green
Usual Treatments - Heat
Hardness - 7 to 7.5
Major Sources - United States, Brazil, Afghanistan, India, Kenya, Madagascar, Myanmar, Pakistan, Mozambique
Tourmaline, Pink
Usual Treatments - Heat, Radiation
Hardness - 7 to 7.5
Major Sources - Brazil, India, Afghanistan, Myanmar, Kenya, Tanzania, United States, Mozambique
Turquoise
Usual Treatments - Plastic, paraffin, silicon
Hardness - 5 to 6
Major Sources - Iran, USA (Arizona, New Mexico), Egypt, Australia, Mexico
Zircon, Blue
Usual Treatments - Heat
Hardness - 7.5
Major Sources - Kampuchea, Sri Lanka, Myanmar,
Australia, Thailand, China