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Matura diamond

or Ma·ta·ra dia·mond

[mah-ter-uh, mat-er-uh]
noun Jewelry.
  1. a zircon heat-treated to render it colorless: not a true diamond.
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Origin of Matura diamond

First recorded in 1875–80; after Matura, town in Sri Lanka
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018