Colour is another important factor that influences the price of a diamond. Diamonds are graded for their colour alphabetically starting at D colour going down to Z colour. Diamonds that are colourless or show the least amount of colour obtain the highest prices along with fancy coloured diamonds such as pink, red, green and blue [...]

Grading polished diamonds for colour means determining the amount that the diamond’s “body colour” deviates from the whitest possible colour. This concept should not be confused with the sparkle, brilliance, or scintillation of the diamond.
Because diamonds have a high brilliance and dispersion of light, the colour grade cannot be accurately determined by looking at the [...]