Changing it up. These color-change gems include garnet, tourmaline, fluorite and glass. Can you guess which is which? Color-change gemstones display a distinct change in color when they are viewed under daylight or fluorescent lighting (daylight equivalent) as compared to incandescent light. Color-change in gemstones is caused by a gem's absorption spectrum. If a gem absorbs very little of a certain wavelength, the gem will appear to be that color, because that color is reflected into the viewer
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