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Rarity equals value in the diamond trade. Approximately 1 out of 10,000 diamonds mined is a natural colored diamond. Pure yellow diamonds with no overtones are often referred to as Canary diamonds or Canary yellows. The actual yellow diamond color scale in order of rarity and pricing is: Light (X-Y-Z range),  Fancy Light Yellow Diamond, Fancy Yellow Diamond, Fancy Intense, Fancy Vivid and Fancy Deep.

The GIA color-grading scale for diamonds begins with the letter D, representing colorless, and continues with increasing presence of color to the letter Z, or light yellow or brown. The fancy color diamond category is outside the normal D to Z color range.

Fancy colored diamond
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