Class e: colorless. Only gem experts can detect trace colors. This is a very rare diamond.

Class 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.

G-H grade: almost colorless. Compared with higher grade diamonds, it has a slight color. But diamonds of this color still have high value.

I-J grade: almost colorless. A slight color can be detected. The value is higher.

K-M grade: dark color, poor fire color.

N-Z grade: dark color, poor fire color.