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As color-change sapphire, exhibits different colors in different light. Color change sapphires are blue in outdoor light (daylight) and purple under incandescent or pink to reddish-violet in incandescent light. Color change sapphires come from a variety of locations, including Thailand and Tanzania. The color-change effect is caused by the interaction of the sapphire, which absorbs specific wavelengths of light, and the light-source, whose spectral output varies depending upon the illuminant. Transition-metal impurities in the sapphire, such as chromium and vanadium, are responsible for the color change.

Color-Change Sapphire

Color-Change Alexandrites