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Figure 1. The two purple to reddish purple chrysoberyl samples from Brazil studied (left images) and two “normal” alexandrites from Hematia, Brazil (right images) in daylight (top) and incandescent light (bottom) illustrate the lower blue-green transmission with increased trivalent chromium. Photos courtesy of Karl Schmetzer.
“Red” Chrysoberyl versus Alexandrite: The Impact of Elevated Chromium Levels on Colour and Colour-Change Properties

Overview and commentary on the 2014 Journal of Gemmology article “Purple to Reddish Purple Chrysoberyl from Brazil”.

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