/ Dictionary / Index M Matura diamond: Meaning and Definition of Find definitions for: Ma'tu•ra dia'mond Pronunciation: (mä'tur-u, mat'ur-u), [key] — Jewelry. Jewelry. a zircon heat-treated to render it colorless: not a true diamond. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Matty maturate Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language