Guo Jinzhubao Testing Center (Foshan) and Foshan Guo Jin Jewelry Testing Technology Service Co., Ltd. are formal jewelry testing service organizations that have passed the qualification certification (metrological certification) of national product quality supervision institutions and have been recognized by laboratories. The laboratory has obtained CMA measurement certification. The center has two jewelry testing offices in Beijing and Guangzhou to facilitate customers' consultation and testing services. It is a regular testing institution.