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Since amethyst, by definition, is the violet to purple shade of quartz, there is really no such thing as green amethyst. The term "green amethyst" makes as much sense as "red emerald" or "yellow ruby". Green quartz is sometimes incorrectly called green amethyst, which is an actual misnomer and not an acceptable name for the material, the proper terminology being Prasiolite. It is a rare stone in nature; artificially produced Prasiolite is heat treated amethyst. It is actually against Federal Trade Commission Guidelines to call prasiolite "green amethyst." Other names for green quartz are vermarine, greened amethyst, or lime citrine. (source)
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| Ocean life pendant with amethyst |
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