Aside from the price factor, how to ensure not to be cheated by fake goods has become the most concerned and headache problem for consumers. Professional testing institutions certified by national certification bodies, with professional, authoritative and fair appraisal, check the quality of jewelry for consumers and become an important basis for consumers to rest assured of consumption. Formal jewelry sales should have supporting appraisal certificates to clarify the quality of jewelry and ensure consumers' right to know. Therefore, consumers must not forget to ask for an appraisal certificate when buying jewelry, and carefully check whether the corresponding contents of the product label and certificate are consistent, especially the number and photo. At the same time, diamonds have a set of internationally accepted and standardized appraisal standards, so although the contents and items presented in the diamond appraisal certificate may be similar. However, several basic necessary and sufficient conditions must be met. The items related to the diamond appraisal certificate are as follows: Diamond picture: located in the center of the front of the diamond appraisal certificate, it should be a physical photo of the corresponding diamond ring or loose diamond, and the photo taken and pasted on the certificate should be consistent with the purchased physical object. Number: The number of diamond ornaments on the regular diamond appraisal certificate should be consistent with the number on the price tag attached to the diamond ring. This number is generally not repeated, only. Steel seal: the diamond appraisal certificate must have a clear steel seal, with the words appraisal unit and the anti-counterfeiting mark of the appraisal unit on the steel seal. Date: The date on the certificate refers to the valuation date of the diamond. Shape &; Cutting): refers to the cutting and grinding shape of diamonds. Generally, round diamonds are more common, including squares and diamonds. Size: This item records the maximum diameter of the diamond and the size of the main part of the whole body in millimeters ... Weight: On the certificate, the weight unit of the diamond is carats, accurate to the third decimal place. Also marked as the total weight, the unit is generally gram (g). Color grade: According to GIA's color grade table, the color grade of diamonds is divided into 23 grades, from completely colorless D to yellowish brown Z. Among them, D.E.F belongs to the colorless range, G.H.I.J belongs to the near colorless range, K.L.M is light yellow, and below N is light yellow. The name below Z is colored diamond, which is very expensive. Clarity grade: the classification of diamond clarity grade is the sum of the internal and external characteristics of diamonds detected by skilled appraisers under a magnifying glass of ten times. Factors such as the size, number, location, characteristics, color or visibility of features determine the level of clarity.