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Alexandrite is the color change variety of the mineral chrysoberyl. In incandescent or candle light it turns to a purplish or brownish red color. In flourescent or daylight it turns to a green or a blue-green
color. Due to this change, poets have given it the description of "emerald by day and ruby by night."
Alexandrite received its name from Alexander II, Czar of
Russia, because it had been said that Alexandrite was discovered in the Ural Mountains of Russia on his birthday in 1830.
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