Diamond Color grades

Colorless diamonds and diamonds that are yellow or yellowish brown are grouped into the categories shown below. These grades do not apply to fancy colored diamonds--they have their own color grading standards.

D-E-F
Colorless.

G-H-I-J
Nearly colorless.

K-L-M
Faintly tinted, usually yellow.

N-O-P-Q-R
Lightly tinted, usually yellow. Tint can be seen with the naked eye.

S-T-U-V-W-X-Y-Z
Tinted, usually yellow, may progress to brownish. Tint visible to the naked eye, even when mounted.