CTA-the abbreviation of China Quality Inspection Alliance and China Inspection Warner Quality Technology Center. (It has nothing to do with jewelry. There are individual appraisal stations that do diamond appraisal, which is the non-mainstream of jewelry appraisal. )
The National Gold and Silver Products Quality Supervision and Inspection Center is a national product quality supervision and inspection institution established by the AQSIQ according to law. Mainly engaged in precious metal identification, supplemented by jewelry business.
Of course, there are many more. National Jewellery and Jade Quality Supervision and Inspection Center
GTC—— National Light Industry Jewelry Quality Supervision and Inspection Center
GAC- China Gemstone Association
GJC—— Jewellery Testing and Research Center of Jewellery Chamber of All-China Federation of Industry and Commerce
At the same time, each province and city has its own quality supervision and testing center. Are all legal.
No fakes have been found yet. ?
At present, GIC (China Geo University) is the most widely used and recognized certificate in jewelry industry. Because a well-trained GIC jewelry appraiser is the most important force in the country, many websites support free re-inspection.