Appearance Violet, lilac or mauve quartz is called amethyst. Amethyst is sometimes heat treated to form citrine . Amethyst crystals can form together with citrine crystals to form bi-colored quartz called ametrine . Amethyst is the birthstone of the month of February. More information on gemstone enhancements.
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Actual carat weight may vary from the average carat weight listed. AAA Dark, clean, little or no color zoning, good cut. AA Medium dark, clean, little or no color zoning, goot cut. A Medium light, clean, little or no color zoning, goot cut. All rights reserved.