National quality inspection organization. China Gold, Silver and Jewelry Quality Inspection (Guangzhou) Center Donghai Sub-center is a legally authorized jewelry and jade quality inspection institution. It has passed the qualification certification of the national product quality supervision and inspection agency and is a national quality inspection agency authorized by the AQSIQ according to law. Inspection of Gold, Silver and Jewelry Quality Inspection (Guangzhou) Center Donghai Sub-center Inspection and appraisal scope: appraisal and appraisal of jewelry, jade and raw materials, diamonds, ornamental stones, precious metals and ornaments; Nondestructive testing of jewelry, thickness of precious metal coating in jewelry, release of nickel and determination of harmful elements in jewelry.