COLOUR

In a diamond, the finest colour is no colour at all. However, as this is a matter of taste, the person wearing the diamond is the one to decide which colour they think is most attractive. The whiter the diamond, the more exclusive it is. The yellowish/greyish/brownish colour found in most diamonds results from nitrogen getting into the carbon. White diamonds are very rare. 

The most exclusive diamonds are colourless and graded as a D diamond; the color scale follows the alphabet:

D-E (River) Completely colourless, rarely white.

F-G (Top Wesselton) Colourless, white.

H (Wesselton) Almost colourless.

I (Top Crystal) Negligible colour toning, but not white.

J-K (Crystal) Colour toning

K-L (Top Cape) Slightly yellowish

M-N (Cape) Yellowish/brownish/greyish

Diamonds are also available in other colours, such as green, red, blue, or pink. This is where other substances have sneaked their way into the carbon structure. These other colours are extremely uncommon, and very often, naturally colored diamonds are more expensive than completely white diamonds.

It is important to know that most colourful diamonds on the market do not owe their colour to nature but have been coloured artificially.