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Amber is a yellow, brown or orange organic gem, neither a crystal nor a mineral. It is a product of nature, the fossilized resin of prehistoric pin...

Chrysoprase is a bright apple green, translucent stone, whose color often caused ancient jewelers to confuse it with Emerald. A cryptocrystalline C...

Yellow Opal is transparent to opaque, milky white to pale yellow in color. It sometimes features dark brown to black dendritic inclusions that bran...