Understanding the meaning of diamond hue aids in the selection of the ideal diamond. Surprisingly, the absence of colour is used to assess the hue of most gem-quality diamonds. Like a drop of pure water, a chemically pure and structurally perfect diamond has no colour and thus a higher value. The GIA’s D-to-Z diamond colour-grading system compares a stone’s colourlessness to masterstones of known colour value under controlled lighting and precise viewing conditions.

Many of these colour differences in diamonds are so minor that they are undetectable to the untrained sight; yet, these differences have a significant impact on diamond quality and price. As a result, getting a GIA expert’s advice on the optimal hue for your diamond is critical.