The history of Turquoise Jewelry dates back all the way to ancient Turkistan and regions of Caucasus in the 3rd century A.D., and is thus more commonly known as "Persian Turquoise". This name also applies to those gems mined in the United States, as long as they have no traces of brown or black veining on them. Because turquoise is a hydrous phosphate of copper, it's actually is very soft - topping 6 on Mohs scale - yet it still can take a good polishing.
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The history of Turquoise Jewelry dates back all the way to ancient Turkistan and regions of Caucasus in the 3rd century A.D., and is thus more commonly known as "Persian Turquoise". This name also applies to those gems mined in the United States, as long as they have no traces of brown or black veining on them. Because turquoise is a hydrous phosphate of copper, it's actually is very soft - topping 6 on Mohs scale - yet it still can take a good polishing.
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