Reliable. According to official website's inquiry, Tengchong Zhong Jian Jewelry Appraisal Certificate is an appraisal certificate issued by the Gold, Silver and Jewelry Quality Inspection Center of Quality Inspection Technology, and it is a national appraisal institution with jewelry inspection qualification. There is no problem with the certificate issued after product testing, which is recognized by the state and safe and reliable. So Tengchong's jewelry appraisal certificate is reliable.