Chrysoberyl Species and Variety

"Alexandrites are, on the whole finer than the Uralian emeralds, the columbine red colour seen in artificial light being especially beautiful... Its colour by daylight was a fine sap-green with a trace of red, while in candle-light it appeared a full columbine-red, scarcely distinguishable from a purplish-red Siamese Spine." Max Bauer