Zhongchuan Jewelry Testing Center is formal and safe. Zhongchuan Jewelry Quality Inspection Center, according to the national laboratory qualification evaluation standards, has been strictly examined by the national quality and technical supervision department and obtained the metrological certification certificate. But it's best to go to the jewelry testing center or the precious metal testing center for testing. There is a quality inspection center every other provincial level, and you can take it for testing, which is authoritative by the state.