Diamond in nature occurs in all colors of the spectrum. Although commonly thought to be completely colorless, those diamonds are in fact extremely rare... Actually, diamonds usually have discreet touches of yellow or brown shades.

On that basis these is an internationally accepted scale for color, indicated by the usage of the latin alphabet letters in scale from D to Z. Rules are very simple: the whiter the stone, it is marked by a letter closer to the initial letter of the alphabet. The similar rule applies for diamond values: fewer colors means higher price.

Diamond color is graded by comparing a sample stone to a master stone set of diamonds. A trained diamond grader compares a diamond of unknown grade against the series of master stones. This process occurs in a lighting box, fitted with daylight equivalent lamps. Also, accurate color grading can only be performed with unset diamonds.

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