Emmanuel Fritsch, Shane F. McClure, March 1, 1999
Millions of carats of turquoise have been enhanced by a proprietary process called the Zachery treatment.
Read MoreWang Fuquan, March 1, 1986
Chinese gem-quality turquoise is sky blue, greenish blue or bluish green in colour.
Read MorePeter C. Keller and Wang Fuquan, March 1, 1986
China has identified many deposits with significant potential to produce gemstones; various species are discussed.
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