There are eight distinct colour saturation grades for Blue diamonds: Very Light - Light - Fancy Light - Fancy - Intense - Deep - Dark - Vivid.

Additionally there are various colour combinations that must be accounted for including; Grey-Blue and Green-Blue. Blue diamonds are created when boron atoms are trapped in the diamonds atomic structure, which alters the absorption spectrum of the stone. Mostly found in South Africa and the extinct mines of India, blue diamonds tend to be modified by grey or green.