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Meaning of cubic zirconia

cu'bic zir•co'ni•a

Pronunciation: (zûr-kō'nē-u), [key]
— pl. -ni•as.
  1. an artificial crystal resembling a diamond in refraction, dispersion, hardness, and color, used in jewelry. Abbr.: CZ Sometimes,
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.