Diamonds are transparent, most display barely perceptible hints of color. The less color in a diamond, the more rare it is.
Diamonds are graded ona color scale from D through Z, based on their degree of colorlessness. Harry Winston selects colorless diamonds from the top three color grades D, E, F for our enagagement rings. These are the most rare and, therefore, the most valuable.
Fancy colored diamonds are an exception and are also much sought after due to their extreme rarity – particularly yellows, pinks and blues. Their quality is judged by the intensity of their hue, and unlike diamonds, the more color, the rarer.