Did you know: GIA created the 4Cs of diamond quality, the universal standard for assessing diamond value. Diamond color grading of most gem-quality colorless diamonds is based on the absence of color. A truly colorless diamond has no hue, and therefore a higher value. The scale begins with the letter D, representing colorless, and continues, with increasing presence of color, to the letter Z. Let GIA help guide you through the D-to-Z diamond color-grading scale with this quick video! | 4Cs of Di