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ZH Gems - Turquoise Stone Suppliers and Wholesale Turquoise Jewelry Gemstone Company Since 2010  

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For Valuable Pieces, Go International — For Ordinary Ones, Domestic

For Valuable Pieces, Go International — For Ordinary Ones, Domestic

Key domestic testing authorities include NGTC (National Gemstone Testing Center) and GIC (China University of Geosciences). International authorities include GIA (Gemological Institute of America), GRS (GemResearch Swisslab), and SSEF (Swiss Gemmological Institute). For valuable jewelry, choose an international authority; for ordinary pieces, a domestic one is sufficient.

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