My appraiser qualification certificate is IGI's. As a person in the jewelry industry, I just want to say that if you want to learn jewelry knowledge systematically, IGI is the only one. As an internationally renowned jewelry institute, IGI should be familiar with some industry rules and standards in the international market. Moreover, if you are interested in the jewelry appraisal industry, the recognition of foreign certificates in the market is higher. Generally speaking, NGTC is common in China, and there are also national jewelry inspectors, CGC and GTC.