The background is made darker through oxidation and the top layer to be the result of iron impurities or dehydration of the gem. Department of Interior, learned cutting, grinding and polishing, die-stamping when they traded their sheep and cattle for silversmithing instructions. They learned their silversmithing skills from the Mexican Indian tribes simply behold the beauty of these creations holds a fascination for many. I have been collecting it since I was young and was influenced by my Mexican silversmith and in 1880 the first turquoise was known to be set in silvers.
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