Diamond colors can vary widely from colorless, (also called white), to the fancy colored diamonds, which is a term used to describe basically any desirable color of diamond other than white.

Fancy colored diamonds can be found in brown, yellow, blue, green, pink, and red, and occur in various degrees of hue, saturation, and intensity. Colored diamonds can be classified into two categories: as untreated, unenhanced, naturally occurring diamonds, or as treated/enhanced colored diamonds.

The color grading system described here was developed by the Gemological Institute of America, (GIA). It is the standard grading system used in the U.S. and, for the most part, around the world. Diamond color grades are represented by letter grades starting at