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Blue Diamond Color Scale . We may earn commission on some of the items you choos. Unlike the argyle scale, the gia color scale is meant to evaluate white diamonds, not colored ones. Diamond Color Scale World Diamonds YouTube from www.youtube.com Any stone within that range falls within the “normal color range.” gia color grades. As the content of boron increases, so does the intensity of the blue color. Diamond color is the hue of a diamond based on the gia diamond color scale, which grades the diamond’s color on a spectrum of d (colorless) to z (light yellow hue).