China Shoujian (Shenzhen) Jewelry Testing Co., Ltd. is a private testing institution established on 20 16, but it spends a lot of money on counterfeiting online. The mechanism is real, but not very reliable.

The state has strict qualification requirements for jewelry and jade quality appraisal institutions, and the appraisal certificate issued is only valid if it passes the review. The identification marks of CMA, CAL and CNAS on the appraisal certificate reflect the legitimacy and authority of the institution. Therefore, it is one of the most important ways to distinguish the authenticity of the certificate by seeing whether there are these three marks on the certificate.