Natural fancy color diamonds are typically evaluated primarily on color intensity, meaning that deep, vivid shades of color are valued much higher than a pale version of the same color. The presence of secondary colors can increase or decrease the value of the stone as well.

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The GIA standard grading system for natural fancy color diamonds rates hue, tone and saturation:

Hue: The characteristic color of the diamond.

Tone: The relative lightness and darkness of the color.

Saturation: The color’s depth or strength

Using highly controlled viewing conditions and color comparators, a fancy color diamond grader selects one of 27 hues, then GIA offers two types of grading report for natural color diamonds.

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