1, the color of the diamond is colorless, and the darker the tone, the worse the quality. D-F is colorless, and G-J is nearly colorless, which basically has no collection significance from the perspective of K, and the price difference of each grade is generally 10%-45%.

2. Transparency Observe the cleanliness of the diamond carefully under the microscope. The more defects, the more obvious the position, the worse the quality and the lower the price. From high to low, it can be divided into fl, if, vvs 1, vvs2, vs 1, vs2, si 1, si2, si3, p 1, p2, P3.

3. Weight (carat) 1 carat (carat) = 0.2g (gram). Divide one carat into 100 parts, with one point for each part. The greater the weight, the higher the value. The weight of diamonds is graded, and the price difference of a grade sometimes reaches 1000 yuan or more.

4. Cutting from high to low is excellent, very good, good, average and poor.

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