noun. a white crystalline oxide; used in refractories and in insulation and abrasives and enamels and glazes.
1. Noun, singular or mass Over time, cubic zirconia may yellow or chip, but they can get wet without losing their sparkle since these gem substitutes are set in silver or gold. 2. Proper noun, singular Cubic zirconia (CZ) is a diamond look-alike that costs a fraction of what a diamond does. 3. Adjective It only takes up to 20 minutes to keep your cubic zirconia jewelry shining like real diamonds.