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Diamond Color Grading Starts with the Letter "D": Why?
The color grading for colorless to near colorless scale is denoted in letter grades that run from "D" to "Z". Most diamonds used in jewelry are nearly colorless with faint yellow or brown tints. These diamonds fall in the normal color range. A diamond that is said to have 'fine color' has little or no visible coloration. The less color, the higher the value.
The GIA (Gemological Institute of America) instituted the "D-Z" scale back in 1953. Until that point, there were various poorly defined color grading scales that were confusing to consumers.
Color systems that were used ranged from numbers (0,1,2,3) to Roman Numerals (I, II, III). Letter grades were also used, e.g.; A, B, C, and even "AA". Descriptive terms such as "blue-white" and "gem-blue" were also used. All of these grades had shifting definitions and variances depending on the dealer being shopped.
GIA decided to make a fresh start and introduce a color-grading scale that would have absolutely no connection to any of the previous scales. Thus the GIA scale starts at the letter D.
Today, this GIA color grading scale has universal acceptance and is used by all grading laboratories and tradespeople.
Above: GIA Color Grading Scale.
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