National Gemstone Testing Center
National Gemstone Testing Center (NGTC) is an national gemstone quality inspection institution authorized in accordance with the law. Approved by the national level of product quality supervision & testing Institution (metrology accreditation, authorization) and laboratory accreditation, NGTC is an authority for domestic jewelry and gems inspection, and is designated as national level of scientific and technological achievements appraisal institution, import & export commodities inspection laboratory and laboratory appointed by the China Consumers Association.