Opal
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Opal jewelry is perhaps the most captivating and versatile gemstone jewelry. Opal types include the Fire opal, Black opal, Boulder Opal, Milk Opal, and White Opal. Australia is the classic country from which 95% of all Fire Opals are mined.
Over 100 million years ago Central Australia was covered by an inland sea and sediment saturated with silica surrounded the shoreline. Who would have guessed this silica would form the gorgeous opals we see today?
After the sea receded to become the Artesian basin, natural conditions released the silica into cracks in rocks, layers in the clay, and fossils. Opal formed in those cracks, making this gemstone one of the few to form in sedimentary rock. Even today, opal contains 6-10 percent water, leftovers from that sea from which it was created.
Black Opals have the most striking colors and are more valuable than Crystal or White Opal. How the opal is cut and how the light is refracted determines how many colors will be seen in the opal.
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