How about Huajin National Inspection?
All right. Huajin National Inspection (Shenzhen) Gold, Silver and Jewelry Inspection Center mainly provides services such as gem identification, diamond grading, precious metal composition and content detection in jewelry, and employs national registered jewelry and jade quality inspectors, and also has professionals with jewelry inspector qualification certificates certified by authoritative institutions at home and abroad; Equipped with more than 40 sets (pieces) of jewelry and jade detection instruments and auxiliary equipment, its configuration is ahead of the domestic level, which fully guarantees fair, accurate, scientific and standardized detection services.