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In the world of rare gemstones, alexandrite is near the top. Let's learn more, courtesy of Dr. Aaron Celestian (Curator, Mineral Sciences): The mineral name is chrysoberyl, a beryllium aluminosilicate (BeAl2O4). Chrysoberyl, on its own, can have a variety of colors from yellowish-white to blue with hints of green. The color-change variety of chrysoberyl is given the name alexandrite, usually from red to green in different light sources. The 'alexandrite effect,' and the reason for the color chan
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