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. 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 use master diamonds of known color for comparison.
The lowest quality of diamonds are yellow in color. Slightly better are light yellow . Better are very light yellow . Good quality are faint yellow . Very good quality are near colorless .