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Global Trade Ctr, Natl Gems & Jewelry Technol Adm Ctr, Beijing Gems & Jewelry Res Inst, 22 F Bldg C,36 North Third Ring East Rd, Beijing 100013, Peoples R China Global Trade Ctr, Natl Gemstone Testing Ctr, 22 F Bldg C,36 North Third Ring East Rd, Beijing 100013, Peoples R China