It is divided into five major levels: LC, VVS, VS, SI and P, and further subdivided into ten minor levels: LC, VVS 1, VVS2, VS 1, SI2, P 1, P2 and P3.

For diamonds with a mass below (excluding) 0.0940 g (0.47 carat), the clarity grade can be divided into five grades.

Color level

According to the change of diamond color, it is divided into 12 continuous color scales, and English letters D, E, F, G, H, I, J, K, L, M, N, < n represent different color scales.