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Matura diamond

American  
[mah-ter-uh, mat-er-uh] / ˈmɑ tər ə, ˈmæt ər ə /
Or Matara diamond

noun

Jewelry.

  1. a zircon heat-treated to render it colorless: not a true diamond.

Etymology

Origin of Matura diamond

First recorded in 1875–80; after Matura, town in Sri Lanka

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.