The best color is no color.

Diamonds are found in a range from colorless to yellow and they are color graded from "D" through "Z." The more colorless, or white, the diamond is, the higher the price.

It is the colorless diamond that is most valued because it's the rarest. The difference between one color grade and another is very subtle, particularly to the untrained eye. Although increasing shades of yellow reduce the value of a diamond, they do not necessarily reduce its beauty. If a diamond is well cut, its refraction and dispersion of light will often disguise a degree of color.

The two major groupings are colorless and near colorless. Almost all Mervis diamonds are in this range.