Mark the quality. For precious metals below 500g, two decimal places shall be reserved, and the quality tolerance shall be 0.01g.. Below 2000 grams, one decimal place, and the tolerance is 0. 1 gram. In addition, the mass of the main drill is greater than 0. 10ct, which should be consistent with the mark on the jewelry.

Product standard number on the label: A qualified jewelry should correspond to relevant standards, such as national standard (GB), industry standard (QB), local standard (DB) or registered enterprise standard number.

Name and address of the manufacturer on the label: The legally registered name and address of the manufacturer or sales enterprise will be displayed on the back of the label. Registered trademarks or abbreviations can also be used on labels.

Must have a certificate of conformity, a label of conformity, a seal of conformity, etc. It can also be inspection label, appraisal certificate, inspection report, etc. Issued by a third-party inspection agency with certification and accreditation qualifications.