Because the color of diamond is equivalent to a high-quality filter, its function is to reduce the escape of reflected light. The whiter the color of the diamond, the more intense the color of the diamond flashes. Similarly, colorless diamonds are rarer than yellow, and according to the different degrees of color from light to dark, the grades are divided into D, E, F, G, H, I-J, K-L, M, N-O, P-R and S-Z. Most gem-grade diamonds range in color from colorless to light yellow. Below is the grade map corresponding to the diamond color. \x0d\D: completely colorless. The highest color level is extremely rare. \x0d\E: colorless. Only gem experts can detect trace colors. This is a very rare diamond. \x0d\F: colorless. A small amount of color can only be detected by jewelry experts, but it is still considered colorless. It belongs to high quality diamonds. \ x0d \ g-h grade: nearly colorless. Compared with higher grade diamonds, it has a slight color. But diamonds of this color still have high value. \ x0d \ I—Grade J: almost colorless. A slight color can be detected. The value is higher. \ x0d \ k-m grade: dark color, poor fire color, not recommended for customers. \ x0d \ n-Z grade: dark color, poor fire color, not recommended for customers.