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The best color is no color at all. Diamonds allow light to be
reflected and dispersed as a rainbow of color. This light dispersion, or color
flash, has no effect on the technical grading of color.
The absolute finest colorless stone carries a D rating, descending
through each letter of the alphabet to Z, designating a diamond of light
yellow, brown, or gray. This body color may be caused by the presence of trace
elements, such as nitrogen, within the atomic framework of the carbon crystal.
As the body color becomes more intense, the grade for color
descends the scale. It is always best to compare diamonds graded by either the
Gemological Institute of America (GIA) or the American Gem Society (AGS) for
accurate color grading.
For best buy option regarding color it is recommended to go for a
diamond with a color grade of K or better.