The diamond color grading scale varies from totally colorless to light yellow. The differences between one diamond color grade and another are very subtle and difficult to distinguish.

D-F: Absolutely colorless. The highest color grade, which is extremely rare. G-J: Near colorless: good to very good color, and this diamond may "face up" colorless when mounted, especially in white gold or platinum. K-M: Light but noticeable yellow or brown tint. Not recommended for larger diamond stone purchases, especially in engagement rings. Out of the 4 C's, color and cut are the two most important characteristics of a diamond. Do not compromise on color. An "H" color or better is usually best.