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Alexandrite

 

Alexandrite is a variety of mineral chrysoberyl, the color-change variety. In incandescent or (spotlight) it turns to a brownish red color. In fluorescent or (daylight) it turns to a green blue-green color. Due to this change poets have given it the description of “emerald by day and ruby by night”. Alexandrite received it name from Alexander II, Czar of Russia because it has been said it was on his birthday in 1830 that Alexandrite was discovered, in the Ural Mountains of Russia.
Wedding Anniversary: 55th
Astrological Sign: Gemini (May 21 – June 19)
R.I.: 1.746 – 1.755 (+. 004, -. 006)
S.G.: 3.73 (+. 02)
Hardness: 8.5
Toughness: Excellent
Care: Normal
Enhancements: None known
Principle Sources: Brazil, Sri Lanka, and USSR