GIA is the most authoritative diamond identification certificate in the world at present, and it is a certificate to identify the grade of diamonds and the authenticity of gems. Every diamond with GIA certificate is marked with GIA number code, which is the same and unique as the code on the certificate. So many diamond ring companies must have this certificate now. Without this certificate, it is difficult to distinguish between true and false. National inspection is a domestic authoritative certificate, and its diamonds are not as detailed as GIA certificate. It is only a domestic appraisal agency, only for some small domestic manufacturers. A big name like Levi's, with a score of more than 30 points, will be inlaid with loose diamonds with GIA certificates. Not only that, every man in Levi's needs a real-name registration system for customization, which means "never give up".