Do you sell green amethyst?

Amethyst, by definition, is violet to purple colored quartz. So there is really no such thing as green amethyst. The gem sometimes sold as green amethyst is what gemologists call prasiolite, which is a leek-green quartz produced by heating amethyst to about 500 degrees centigrade. Unfortunately the color is known to fade when exposed to strong sunlight, so peridot would be a much better choice in this color range. You may also see green quartz in a vivid mint green or blue-green hue, but this is almost always synthetic material produced by the hydrothermal method.

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