When many people buy jewellery, they will ask the merchant for an appraisal certificate to facilitate their rights protection. However, as the saying goes, the layman looks at the doorway and the layman looks at the excitement. The certificate is there, but the contents of the certificate can really be understood. Today, Xiaobian teaches everyone how to look at the contents of the diamond certificate. Taking the content of the national inspection certificate as an example, the national inspection diamond certificate generally contains seven items. (1) Total quality: The national inspection certificate is generally issued after the diamond is inlaid, so the certificate indicates the total quality of the whole piece of jewelry. (2) Shape: refers to the shape of the diamond, which is generally a circular faceted type. (3) Color: The color of the diamond. Generally speaking, the color of the diamond is compared with the loose diamond. Because of the color of the bracket, it is normal to have a difference between the upper and lower levels. (4) Clarity: The amount of inclusions inlaid with diamonds. However, the inlaid diamonds have a higher grade than the loose diamonds due to the influence of the brackets and claws. (5) Bracket: refers to the purity of the precious metal of the bracket, generally the markings such as Pt950, Au750, G750, etc. (6) Cut level: The difference between the national inspection certificate and the GIA certificate is mainly here. The GIA gives the overall grade, and the detailed scale range of the platform width and the pavilion depth given by the national inspection certificate is more accurate. The width of the platform is 53.0-66.0%, and the depth of the pavilion is 41.5-45.0%, which is equivalent to the excellent level of the GIA certificate. (7) Remarks: Other relevant information about this piece of jewelry. Colorless Optical Glass Windows Nantong Haisheng Optical Co.,LTD , https://www.haisheng-optical.com