a variety of chrysoberyl, green by daylight and red-violet by artificial light, used as a gem.
Historical Examples

This species furnishes us alexandrite, chrysoberyl cat’s-eye and less valuable chrysoberyls of yellowish-green color.
A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public Frank Bertram Wade

I think I’ll send that alexandrite as a sort of peace offering.
The Trail of Conflict Emilie Baker Loring

Chrysoberyl (alexandrite and also the greenish-yellow chrysoberyl).
A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public Frank Bertram Wade

Specimens of the alexandrite, named after Alexander I., are also to be seen here in beautiful form and clearness.
Due North or Glimpses of Scandinavia and Russia Maturin M. Ballou

a green variety of chrysoberyl used as a gemstone


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