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cubic zirconia

[zur-koh-nee-uh]
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noun, plural cu·bic zir·co·ni·as.
  1. an artificial crystal resembling a diamond in refraction, dispersion, hardness, and color, used in jewelry. Abbreviation: CZ
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Sometimes cu·bic zir·co·ni·um [zur-koh-nee-uh m] /zɜrˈkoʊ ni əm/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018