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Learn about Gemstones Alexandrite Color: color changes, from bluish green [daylight] to purple, red or brown [incandescent light] Hardness: 8 Refractive Index: 1.74 – 1.77 Density: 3.68 – 3.80 Chemical Composition: BeAl2O4 Crystal Structure: orthorhombic Origins: Russia, Brazil, Tanzania, Madagascar, Zambia, Sri Lanka, Burma, India. Back

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