The diamond color scale extends from D (colorless) to Z (light yellow or brown). While most consumers think of diamond jewelry using colorless diamonds the truth is that they are very rare and nearly colorless diamonds are used in most jewelry. Color grades are determined by comparing each diamond to a master set. Each letter grade represents a range of color and is a measure of how noticeable a color is.
Fluorescence
Some diamonds emit a visible light when exposed to ultraviolet radiation. Fluorescence is not a factor in determining color or clarity grades. In fact, it is estimated that only about 2 percent of diamonds are negatively effected by fluorescence.
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