Millions of carats of turquoise have been enhanced by a proprietary process called the Zachery treatment.
Read MoreChinese gem-quality turquoise is sky blue, greenish blue or bluish green in colour.
Read MoreTwo techniques for identifying natural, treated and synthetic turquoise are examined.
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This article, from the Summer 2010 issue of Gems & Gemology, is a compilation of abstracts of important gemmology-related articles published outside Gems & Gemology.
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