When we speak of the Color of a diamond, we refer to its "whiteness", or lack of color. Of course, this does not apply to fancy color diamonds, which can range in color from blue to light yellow. Fancy colored diamonds, as they are called, are graded differently.
When grading the whiteness or lack of color in a diamond, stones are compared to a standardized scale under very strict lighting conditions. Without controlling the value, hue and intensity of the lighting conditions under which stones are viewed, locating a diamond on the color scale would be pointless.
The image which follows shows how minute differences can be. This represents colorlessness (left) to a yellow tint (right).
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