Folk appraisers rely on experience, but some of them confuse the real with the fake, and it is inevitable to make mistakes. Therefore, it is quite necessary to be appraised by the appraisal team and the leading scientific and technological equipment at home and abroad. This is also the reason why many jewels now have to show their jewelry appraisal certificates. Of course, if you want to make your jewelry more credible, GRC certificate is a good choice.