Fancy White Diamonds
White, unlike colourless diamonds, are unusual semi-translucent milky-white in appearance. This colour variety sometimes may look nearly opalescent, somewhat reminiscent of moonstones. The colour in white diamonds, mostly Type IaB stones, is due to the scattering of light in all its different wavelengths which is caused by dense clouds of microscopic pin-point sized inclusions.
White to Bluish-White diamonds without any colour modifiers are the most highly prized, followed by specimens that feature yellow modifiers. All former three colour varieties generally appear bright as opposed to grey or brown modified white diamonds which at best only show a muted play-of-colour effect. Often such secondary hues as blue and yellow are effectively fluorescence.
Main occurrences of white diamonds include Russia as well as Panna, India, and the diamonds finds at Marange, Zimbabwe.