Diamond Color

The "color" of a diamond refers to the presence or absence of inherent coloration in a white diamond. The whiter the diamond is the greater its value since a colorless diamond will allow increased light to pass through it and will consequently emit a greater amount of fire and brilliance. An appropriate analogy would be the difference between a clear glass window's superiority in allowing light to pass through it, versus a (color) stained glass window. Diamonds are graded for color against a white background so as to eliminate the possibility for any outside light to be absorbed by the diamond...more
source: DiamondVues