Turquoise, the semi-precious stone, has long been popular on American Indian jewelry. Turquoise jewelry is now popular with designers of expensive jewelry and a Tiffany necklace of turquoise stones worn by Cate Blanchett to the Academy Awards was newsworthy. Turquoise is found when mining copper. Many mining companies have closed their turquoise production since 2012 to concentrate on the more valuable copper.
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