The seventh floor of Hongtu Building, No.76 Suzhou Road, is the building of Suning Appliance, Hefei Mineral Resources Supervision and Testing Center of the Ministry of Land and Resources. They are CMA, CAL and National Laboratory, and the identification is relatively standardized. Jewelry from the nearby shopping mall is appraised there. The telephone number is 2635629. It is recommended to contact before going. If you just want to know the truth, you can ask for no proof and no invoice, which can be cheaper.