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Diamond Quality Assurance

The National Jewelry Quality Supervision and Inspection Center is a national-level jewellery and jade professional quality inspection agency authorized by the relevant state authorities. It is the authority of Chinese jewelry and jade detection. It plays a guiding role in regulating the domestic jewelry market and promoting the healthy development of the jewelry industry. Ngtc inlaid diamond grading certificate The diamond grading system used by the national inspection mainly ranks diamonds according to the cut, color and clarity of the diamond. The highest level is the rarest and most valuable diamond, and the lowest level has the lowest value. Certificate No.: The certificate number of the jewelry inspection conclusion: Describe the type of diamond jewelry.
Total mass: Describes the total weight of the diamond jewelry.
Shape: Describes the shape of the diamond.
Color: Describes the color grade of the diamond.
Clarity: Describes the clarity grade of a diamond.
Table width ratio: Describes the ratio of the table to the diameter of the cut in the diamond.
Pavilion depth ratio: Describes the ratio of the depth of the pavilion to the diameter of the cut in the diamond.
Precious metal testing: Metal materials used in diamond jewelry.
Remarks: Description of other characteristics of diamonds not mentioned in the report

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