Diamonds with ColourWhile most diamonds appear colourless or "white" when viewed alone, they may actually have subtle yellow or brown hues that are obvious when comparing diamonds side by side.
Diamonds form under intense heat and pressure; during such extreme conditions traces of other elements sometimes become incorporated into their atomic structure. These other elements contribute to a diamond's colour.
The colour grades for diamonds begin with D, the whitest, and continue through the alphabet (E, F, G.). Truly colourless diamonds (the D grade) are extremely rare and highly valuable; a single change in colour grade can significantly affect a diamond's value.
Interestingly, the presence of subtle colour is not rare in diamonds, but the presence of strong colour is extremely rare. Some diamonds actually come out of the ground in well-defined reds, blues, pinks, greens and bright yellows - vivid colours known in the jewellery trade as "fancy." As with other diamond rarities, these stones are highly valued.
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