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Colour is one of the most important factors when choosing a diamond. The ideal colour is the total absence of all body colours (colourless) except in fancy colour diamonds.

GIA has developed the most precise scale of diamond colour grading, and today is universally used in the diamond trade. The colour scale begins with a colour D which represents the rarest and most desirable colour today and descends to the letter Z, which tends to be more brown and yellow.

GIA Colour Scale

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