Diamonds are transparent and may display a hint of colour. Diamond colour refers to the degree to which a diamond is colourless. The less colour a diamond has the more refraction of light they allow and hence more brilliance or sparkle. Colourless diamonds are more rare and valuable. Diamonds which are less white absorb light, inhibiting brilliance.
The Gemological Institute of America (GIA) established a colour grading system for white diamonds that ranges from D to Z, based on the degree to which they are colourless. Diamonds with a “D” colour grade are colourless and most valuable. It has a “pure” or “white” colour. We recommend diamonds from the top three colour grades – D, E and F. These diamonds display a beautiful brilliance.
Diamonds are also found in a variety of colours including yellow, pink and blue. Coloured diamonds are well sought after given they are extremely rare.
Unlike white diamonds, the quality of fancy coloured diamonds is judged by the intensity of their hue. There more colour, the rarer and hence more valuable they are.