Refers to the overall tint of the diamond or the amount of colour that it contains.

Diamonds are graded on a colour scale which ranges from a D which is colourless to Z which is visibly yellowish.

The majority of natural diamonds are “white”. But most of them have a slightly yellowish tinge. The most valuable ones are the colourless or near colourless ones. The rest are graded according to the extent of their “yellowishness”.

Barring a few rare and very exceptional natural fancy coloured diamonds, a completely colourless diamond which allows white light to pass through it effortlessly - dispersing it again as rainbows of colour and giving it a great sparkle – is the most desirable.