Peking University Jewelry Appraisal Certificate has expired. You can contact the jewelry appraisal institution: contact the jewelry appraisal center of Peking University or relevant institutions to learn about their replacement policies and procedures. They will tell you how to renew or get a new certificate. Jewelry appraisal certificate is a public trust certificate issued to the authenticity and attributes of rare precious metals, precious stones or jewelry products, which is implemented by professional institutions and professionals who meet the appraisal qualifications.