Shenzhong Guoyin Jewelry Testing Center is recognized by the state. According to official website's inquiry, Zhongshen Guoyin Jewelry Appraisal Center Zhongshen Guoyin Jewelry Testing Center is a branch of China Jewelry Quality Supervision and Inspection Center Co., Ltd. and a testing institution approved by Shenzhen Municipal Market Supervision Administration. Therefore, the test results of China-Shenzhen Guoyin Jewelry Testing Center are authoritative and reliable.