Gemstone Color Chemistry

Gemstones are minerals that are considered pretty enough to use for jewelry and decorations. In many cases, the pure form of the mineral is clear (e.g., quartz), while impurities produce lovely colors, like the yellow and purple of the ametrine pictured here. In the case of ametrine, the quartz is discolored by iron. Are you interested in learning which transition metals are responsible for the color of your favorite gemstone?

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