Editing Emerald (section)

=== Color ===

In [[gemology]],<ref>[http://gia4cs.gia.edu/EN-US/gr-colored-diamonds-gemstones.htm Grading Fancy-Color Diamonds] {{webarchive|url=https://web.archive.org/web/20141102115539/http://gia4cs.gia.edu/en-us/gr-colored-diamonds-gemstones.htm |date=2 November 2014 }}. Gemological Institute of America</ref> color is divided into three components: ''[[hue]]'', ''[[Saturation (color theory)|saturation]]'', and ''[[lightness|tone]]''. Emeralds occur in hues ranging from yellow-green to blue-green, with the primary hue necessarily being green. Yellow and blue are the normal secondary hues found in emeralds. Only gems that are medium to dark in tone are considered emeralds; light-toned gems are known instead by the species name ''[[Beryl|green beryl]]''. The finest emeralds are approximately 75% tone on a scale where 0% tone is colorless and 100% is opaque black. In addition, a fine emerald will be saturated and have a hue that is bright (vivid). Gray is the normal saturation modifier or mask found in emeralds;  a grayish-green hue is a dull-green hue.<ref name=Wise />