Colour

While most diamonds appear white, many of them display hints of colour barely discernible to the naked eye. The closer a diamond approaches colourless, the rarer and more valuable the stone.

Diamonds with a strong pure colour are extremely rare and are called ‘fancies’. Amongst them can be found pink, blue, yellow, green and orange.

Diamonds may come in any color of the rainbow. Except in the case of very rare and fancy colors, the less color in a diamond, the more valuable it is.

Although many diamonds appear not to have any body color at all, trace atomic elements other than carbon (C) may result in slight degrees of yellow, brown or gray body coloring. The color differences are often so slight that they are only detected by comparing them against a master set of laboratory graded diamonds. (via Hearts On Fire)