alexandrite

noun
al·​ex·​an·​drite | \-ˈzan-ˌdrīt \

Definition of alexandrite 

: a grass-green chrysoberyl that shows a red color by transmitted or artificial light

First Known Use of alexandrite

1844, in the meaning defined above

History and Etymology for alexandrite

German Alexandrit, from Alexander I Russian emperor

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The first known use of alexandrite was in 1844

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