It is difficult to learn diamond classification by yourself, and the exam consists of theory and practice. Practice needs to observe a large number of specimens to accumulate experience. NGTC has a diamond grading training course, and after passing the training, it obtained the certificate of intermediate diamond inspector from the Ministry of Labor. If you want to be an appraiser, you must learn diamond classification and gem appraisal, and then you can get the qualification of jewelry appraiser. Is that you can print a jewelry appraiser on a business card or something. NGTC offers two courses: diamond grading and gem identification, but NGTC will not issue a certificate of jewelry appraiser. Therefore, NGTC courses can only be regarded as training, not textual research in the full sense. GIC, China Geo University seems to have it. You can learn about it. GIA's jewelry appraisers also require to pass GIA's diamond grading and gem identification courses, and then GIA will award you a GIA-certified jewelry appraiser diploma, which is internationally accepted. Now GIA and NGTC are cooperating in running schools in China. There are only a few days of face-to-face courses a year, and the rest are completed by correspondence. So the difficulty is relatively much higher. In particular, GIA's gem identification was studied by a friend before, saying it was difficult. If you are not engaged in this major, the estimated pass rate is very low. Talk about costs: NGTC diamond grading class, 2800, gem appraisal, 3800, as well as hundreds of materials costs, certificate fees of the Ministry of Labor and so on. GIA diamond classification seems to be 2W6, and gem identification is about 3W6. Because GIA is more difficult, it is best to attend NGTC training as the basis before reporting to GIA. The specific registration process can be found on the NGTC website, or by phone or email. Www.ngtc.com.cn ·AGS really doesn't know much about this and can't help. I hope what I said above is helpful to you.