The diamond color grade measures how colorless a diamond is. This scale refers only to colorless (white) diamonds, and not fancy colored gems. The color scale goes from D to Z (no diamond of color A, B or C has ever been found), with D being the most white and Z being the most yellow. The most valuable diamonds are colorless.

Colorless diamonds allow most light to pass through the stone and create the most brilliance. However, very few diamonds are colorless, so most diamonds will have a tint of yellow - the less yellow the better.

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