Does the subject want to ask "What's wrong with the cma logo on the front of the jewelry appraisal certificate"? Not appraised by the Jewelry Association. According to official website who inquired about the Jewelry Association, after the jewelry appraisal, the Jewelry Association will issue three internal and external certifications, namely cma, cal and cnal. If there is no sign, it means that it has not passed the appraisal of the Jewelry Association. 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.