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Diamond color code
Diamond color grades, starting with the letter "D" (for colorless), are arranged to the letter "Z" (for light yellow and light brown) as the color deepens, with a total of 23 grades:

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.