Diamond color is all about what you can’t see.The color grade is measured by the amount of color, or lack there of, within the diamond. The process for grading color is measured by looking at the diamond face down on a white background using controlled lighting and precise viewing conditions. The diamond is comparing to diamonds that are graded according to the Gemological Institute of America’s color grading scale. Many of the diamonds you will find within a jewelry store are colorless or slightly yellow. The Gemological Institute of America has established an industry standard scale for grading diamond color. The scale is based on the visible color of the diamond. It starts at D, a colorless diamond. Diamonds graded G will appear colorless facing up but has slight color when facing down. Color will be more visible when you get in the K grade diamonds. Diamonds with a Z grade which is a light yellow colored diamond. Many of the color distinctions are so subtle that the untrained eye may not see any difference but it makes a difference in the quality and price of the diamond.
D-F: Absolutely colorless. This is the highest color grade and quite rare. G-J: Near to colorless. These may appear colorless when mounted in white gold or platinum. K-M: Diamonds in this category have a visible yellow or brownish tinge. These diamonds are not generally recommended for engagement rings and where large-sized stones are appropriate. N-R: Diamonds in this color range have an easily seen yellow or brown tint, but are much less expensive than higher grades. S-Z: For almost all customers, S-Z diamonds have too much color for a white diamond.