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Alexandrite is a ‘pleochroic’ mineral – it changes color under different lighting conditions. The crystals display a green color in daylight and a purple-red color under incandescent lighting. This specimen from Minas Gerais, Brazil, has 3 distinct crystals – 2 of them measure 1/2″ across and the third measures a large 1″. Dimensions: 1.5″ x [...]