In many green diamonds, the color is confined to a thin layer at the surface of the rough stone. The design and cut of the polished diamond must be carefully planned and executed to conserve as much of that original color as possible. Even though the faceting might only preserve a band of green color around the girdle and a small amount in the culet, that can be enough to produce an apparent green color throughout the stone. These diamonds often display a green color which is very subtle.

Most green diamonds have a color that is modified by hints of yellow, blue, or gray. Variations in color, tone, and saturation can make a big difference in the selling price of the gem. The most valuable green diamonds have a pure green color, medium tone, and strong saturation. These colored diamonds might earn a color grade of “Fancy Intense” or “Fancy Vivid.” Such gems are exceedingly rare and will fetch premium prices.