The imprint of AU999 is the imprint of thousands of gold jewelry stipulated by national standards! JY is the maker's mark of gold leaf, and ten thousand feet of pure gold is the maker's mark that confuses people. Let the shop assistant explain to the people that he is one level higher than thousands of gold, and it is thousands of gold, AU9999 gold, with good color, fooling the people and getting it back. There is no evidence, and there is no evidence. The best explanation is that it is the salesperson's own problem. There is no standard of panacea in the national standard. It's the merchants who come to cheat the people!