Industrial and commercial registration enterprises, not individuals, should make good choices. It is recommended to choose the official flagship store. The best identification method is that the seller issues a certificate. For jewelry appraisal institutions that issue certificates, GTC's certificates are relatively high in gold content and relatively strict at present. It is particularly important to note that after receiving the certificate, it is best to check the data in official website according to the number to ensure that the data of the bracelet and the certificate are consistent.