When referring to colour in reference to diamond colour grading one generally refers to the absence of colour. Most diamonds, although appearing colourless, actually have slight tones of yellow or brown. As these tones become more easily apparent, the rarity and the value decrease.

An exception to this would be found in diamonds of rich 'fancy' colour.These are very rare and demand premium prices. 'Fancy' colour diamonds occur in any imaginable colour and some of the highest prices per carat have been recorded for 'intense' red or blue shades.

Sirius diamonds are of exceptional quality and cut from the finest rough.

All colour grades are determined through grading by at least three gemologists. As colour differences between neighbouring grades are very difficult to discern, your Sirius diamond certificate provides you with complete peace of mind' stating a diamond's precise colour grade.