-The color of normal diamond 4C is represented by letters D to M, just as the clarity is represented by LC, VVS, VS, SI and P. As far as the national inspection certificate is concerned, it has never been marked with Chinese characters. However, the quality of diamonds depends not only on the size of color, but also on the cutting of diamonds. Many people ignore cutting, 4c cutting, color, clarity and weight. I hope it helps you.