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Amethyst is originally a deep purple or violet stone, which is the only gem having this color. It is a purple form of quartz or a silicon dioxide crystal (SiO2) and gets its violet color due to irradiation of iron impurities (Fe3+) along with the significant quantities of trace elements.

Indeed, it is the most precious stone of the quartz family. There are times when green amethyst contains more amount of iron compounds inside. After been treated with heat, amethyst loses its natural purple shade and becomes green. Heat treatment is quite common in the gemstones industry. Thus, a heated stone is as valuable as its original form. Green amethyst or prasiolite is available in different colors, which include lime green with a bit of yellow and deep pine-forest green