Jiaojiang District, Taizhou City, Zhejiang Province. According to Baidu map, the address of Diamond Ring Testing Center in Jiaojiang District of Taizhou City is located on the 4th floor of Building 2, No.88, Wei Yi Road, Jiaojiang District, Taizhou City, Zhejiang Province. The National Jewelry and Jade Quality Supervision and Inspection Center (hereinafter referred to as the Inspection Center) is a national professional quality inspection institution authorized by the relevant competent departments of the state according to law, and it is the authoritative institution for jewelry and jade testing in China.