Generally, there are several local testing institutions, such as Tianjin Gemstone Testing Center of Zhigu 4th Road Institute of Geology and Mineral Resources, Hedong District, Tianjin, Tianjin Jinbao Jewelry Supervision and Inspection Center, and some non-governmental organizations, such as sinosteel Tianjin Geological Research Institute, all have testing qualifications. Generally, individuals in testing stations are not allowed to identify, but merchants are required, and a certificate is generally only a few dollars.