Matura diamond
or Ma·ta·ra dia·mond
[ mah-ter-uh, mat-er-uh ]
/ ˈmɑ tər ə, ˈmæt ər ə /
noun Jewelry.
a zircon heat-treated to render it colorless: not a true diamond.
Origin of Matura diamond
First recorded in 1875–80; after
Matura, town in Sri Lanka