Yes, the Geological Bureau has a jewelry building (opposite Baogong Temple), where there are many jewelry companies. Among them, Samsung Geological Jewelry seems to be a jewelry company established by the Geological Bureau, so it can be inspected there. I once asked someone to help me check there. I don't know if I can go abroad to get an inspection certificate. If you don't know the phone number and cost, you can call 1 14 or go.

Only on behalf of personal views, don't spray if you don't like it, thank you.