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Many diamonds may appear colourless to the untrained eye but on closer inspection will almost certainly contain very slight traces of brown, yellow or grey.
Coloured diamonds are also found and can include blues, pinks, greens, browns, oranges and very rarely, reds.
Colour is a decisive aspect when judging the beauty of a diamond. The whiter and more colourless the diamond, the greater its rarity and value.
Generally speaking, it is the colour that gives a diamond its sparkle. The more colourless the diamond, the more brilliantly it will sparkle.
Diamonds are graded on a colour scale which was set-up by the Gemmological Institute of America (GIA). This scale ranges from D (colourless) to Z. The price difference between two adjacent colour grades can be significant.