Blue Nile Glossary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Index
  A classification scale, ranging from Colorless to Extremely Dark, which indicates color intensity in gemstones. Tone should be considered along with color and saturation to help determine the quality of a colored gemstone.

See also: Hue, Saturation, Gemstone Color.


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