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Jewelry Gemstones Diamond Jewelry Gemstones precious stones semi precious stones jewelry

Showing posts with label Amethyst gemstone. Show all posts
Showing posts with label Amethyst gemstone. Show all posts

Amethyst gemstone

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Amethyst gemstone Chemistry Amethyst is the violet variety of quartz; its chemical formula is SiO 2 . In the 19th century, the color of ame...
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