GIA (Gemological Instute of America) Diamond Color Grading Scale
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D E F |
G H |
I J K |
L M N |
O P |
Q R |
S ==> Z |
Colorless |
Near Colorless |
Faint Yellow |
Very Light Yellow |
Yellow Yellow |
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The Diamond Color Palette may vary from ice white to Warm white.
The color differences are really slight and it's very difficult, for instance, to define the difference beween an E and and F.
This is why the colors are "measured" in particular lightning conditions and are always compared with accurated samples.
Completely colorless stones, just like D's, which are extremely rare, are placed at the top of an ideal diamond-quality pyramid.