Color Change
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Definition
A phenomenon in which a gemstone displays distinctly different colors under different light sources, most notably shifting between daylight (fluorescent) and incandescent light.
Detailed Explanation
The most famous color-change gem is alexandrite (a variety of chrysoberyl), which appears green in daylight and red under incandescent light — described by the trade phrase 'emerald by day, ruby by night.' The effect arises because alexandrite absorbs most visible wavelengths except a narrow transmission window that shifts with illuminant spectrum. Color-change garnets, sapphires, and diaspore also exhibit this property. The strength of color change is a primary value factor, with 'complete' change (one hue to a completely different hue) commanding premiums.