Alexandrite - A Big Rough Gemstone (375 Carat )

Often described by gem aficionados as “emerald by day, ruby by night,” alexandrite is the very rare color-change variety of the mineral chrysoberyl. Originally discovered in Russia's Ural Mountains in the 1830s, it's now found in Sri Lanka, East Africa, and Brazil, but fine material is exceptionally rare and valuable.
Alexandrite, a strongly pleochroic (trichroic) gem, will exhibit emerald green, red and orange-yellow colors depending on viewing direction in partially polarised light. However, its most distinctive property is that it also changes color in artificial (tungsten/halogen) light compared to daylight. The color change from red to green is due to strong absorption of light in a narrow yellow portion of the spectrum, while allowing large bands of more blue-green and red wavelengths to be transmitted.
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[@LIFEOFGEMS]

A Big Rough Alexandrite's another Video 👇
ruclips.net/video/lksYI6d7tIA/видео.html

[@rogerhargreaves2272]

I can’t help marvel at this stone. Is this rough from Brazil. I have a trillion cut Alexandrite 13.5 carat and it’s beautiful, from Brazil.