When jewelers refer to diamond color, they are usually referring to the presence or absence of color in a white diamond. Color is a result of the composition of the diamond and does not change over time. The less color present within a white diamond, the more expensive the gem.
Light
Colorless diamonds allow for more light to pass through, thus giving the diamond more sparkle and shine. The formation process of a diamond ensures that a truly colorless diamond is rare. As a result, the whiter the diamond, the more it costs.
Grading Whiteness
Most jewelers refer to a Gemological Institute of America (GIA) scale. The highest rating for a colorless diamond is D and continues all the way to Z, which would be a light yellow diamond.
Colored Diamonds
Color in a white diamond should not be confused with colored diamonds. Colored diamonds, which can range from blue to bright yellow, are actually rare and expensive. These diamonds are more valuable for their color, whereas a white diamond is more valuable for its lack of color.
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