![Study on the effect of heat treatment on amethyst color and the cause of coloration | Scientific Reports Study on the effect of heat treatment on amethyst color and the cause of coloration | Scientific Reports](https://media.springernature.com/full/springer-static/image/art%3A10.1038%2Fs41598-020-71786-1/MediaObjects/41598_2020_71786_Fig1_HTML.jpg)
Study on the effect of heat treatment on amethyst color and the cause of coloration | Scientific Reports
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![set of various amethyst natural mineral stones and gemstones isolated on white background Stock Photo - Alamy set of various amethyst natural mineral stones and gemstones isolated on white background Stock Photo - Alamy](https://c8.alamy.com/comp/G10NNC/set-of-various-amethyst-natural-mineral-stones-and-gemstones-isolated-G10NNC.jpg)