D, E, F (colorless diamond): This kind of diamond is extremely rare and expensive.
G, H (nearly colorless diamonds): the highest cost performance.
I, J (nearly colorless diamond): yellowish, which may be difficult for ordinary people to detect. It's a good choice for people with a small budget.
K, L, M (yellow/brown diamonds): The yellow tone is obvious, which may be seen in daily wear, and it is easy for ordinary people to distinguish it with the naked eye.
N, O, P, Q, R (slightly yellowish diamond): The yellow tone is obvious, and there is a faint color in the diamond with the naked eye.
S, t, u, v, w, x, y, z (light yellow diamond): the color is dark and the fire color is poor. Ordinary people can see that diamonds have obvious yellow tones.