Sellers who continue using the name "green amethyst" could face legal action. In those guides they state that the name "green amethyst" is "incorrect", and that use of the name can be "misleading", "unfair", and "deceptive". In July 2018, the Federal Trade Commission of the United States published a new edition of their Guides for the Jewelry, Precious Metals, and Pewter Industries. Federal Trade Commission on "Green Amethyst" That makes "green amethyst" an incorrect name, just as "yellow emerald" and "red emerald" are misnomers for " heliodor" and " red beryl," respectively. Amethyst, by definition, is a purple variety of quartz. "Green amethyst" is a misnomer (an incorrect name) that some people use for prasiolite. It is found where an amethyst-bearing rock unit has been heated by younger lava flows or nearby intrusions. Naturally Heated Amethyst: Another small amount of amethyst is heated by natural processes. The green color is often unstable and can fade to colorless if the stone is exposed to temperatures over about 150 degrees Celsius. This produces prasiolite with a light green color. Irradiated Amethyst: A small amount of prasiolite is produced by irradiating natural amethyst. This heating changes the amethyst's color from purple to green or yellowish green. Heat-Treated Amethyst: Most prasiolite is produced by heating natural amethyst in a laboratory oven to about 500 degrees Celsius. It is produced by the three processes described below: Prasiolite is a yellow-green to green variety of quartz that is cut into faceted stones for use in jewelry or purchased by gemstone collectors.
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