“Emerald by day, ruby by night” is the metaphor used to describe the charm of alexandrite, a color-changing gemstone in the chrysoberyl mineral group that can reveal green to bluish-green colors under daylight-equivalent light before displaying red to purplish-red colors under incandescent light. The beauty of a single gemstone thus offers another shade to discover when the light source changes, with both the specific color shades and the prominence of the color change varying from stone to stone.
Mineralogically, alexandrite has the chemical formula BeAl₂O₄, with chromium (Cr³⁺) serving as the key element responsible for the color and color-change phenomenon of this gemstone.
(Note: Information regarding meanings and beliefs is based on historical and cultural records and does not represent scientifically proven properties.)
Beyond its color-change phenomenon, alexandrite possesses a fascinating historical background, geographic origins, and detailed cutting considerations as follows.
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