Credible. According to the relevant information of Guangzhou Gaode Jewelry Testing Center, Guangzhou Gaode Jewelry Testing Center is credible. Guangzhou Gaode Jewelry Testing Co., Ltd. is located in Guangzhou, the south gate of China, and was incorporated in Liwan District Administration for Industry and Commerce of Guangzhou on June 23, 2004 with a registered capital of 50,000 yuan.