Definition
The amount or presence of body color in a diamond (colorless to yellowish).
The most prized diamonds are colorless diamonds, because their beauty depends entirely upon their remarkable optical properties. In such diamonds, all the colors of the rainbow are reflected back to your eye. While the majority of gem diamonds appear to be colorless, others can contain increasing shades of yellow to brown, some of which are referred to as champagne diamonds. Other diamonds of exceptional color–red, blue, green, pink, and amber–are known as “Fancies.”
The color grading scale varies from totally colorless to light color or tinted. The difference between one grade and its neighbor is very subtle. Experts never try to remember color; they use master diamonds of known color for comparison.