What is the color scale based on: The International Color Scale, created by the Gemological Institute of America (GIA), is a standardized language for discussing diamond color. The GIA, the world's leading name in gemology, created the standardized scale for color and clarity that we use today. They use a judging system to evaluate each gemstone, where each stone is evaluated by at least 5 gemologists who must give a unanimous grade in order to receive GIA certification. The full color scale ranges from D to Z, with D grade diamonds appearing icy white and Z diamonds having a pale yellow hue.

D	Absolutely colorless or frosted white. The highest color class - extremely rare and most expensive.
TO	Colorless. A rare, high-quality diamond with only minor traces of color detectable by an expert gemologist.
F	Colorless. A slight color was detected by an expert gemologist, but it was still considered a "colorless" grade - a high-quality diamond.
G	Nearly colorless. Color is noticeable when compared to better grade diamonds, but offers excellent value.
H	Nearly colorless. Color is noticeable when compared to better grade diamonds, but offers excellent value.
J	Almost colourless. Slightly perceptible colour - good value.