cubic zirconia

Judith Ripka earrings set with Diamonique cubic zirconias
Photo courtesy of Scott Papper, GIA GG, AJP, CM (NAJA), Global Gemology & Appraisals
Species:  CZ (Synthetic Cubic Zirconia)
Mohs Hardness:  8 to 8.5 out of 10
Color:  Nearly every color, including colorless
RI:  OTL
Birefringence:  None
SR/DR/AGG:  SR
Pleochroism:  None
Spectrum:  Not diagnostic
Fluorescence:  Variable, not diagnostic
SG:  5.60 to 6.00

cubic zirconia facts

Multi-colored CZs set in a sterling silver designer tennis bracelet, by Caspian
Photo courtesy of Scott Papper, GIA GG, AJP, CM (NAJA), Global Gemology & Appraisals

Colorless CZs are commonly used as diamond imitations.

CZs are produced in nearly all colors to simulate sapphires, rubies, emeralds, garnets, topazes, peridots and more.

CZs weigh approximately 70% more than diamonds of the same size and proportions.
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Designer engagement ring, by Vanna K, featuring a cubic zirconia center with pavé-set CZ accents, in sterling silver
Photo courtesy of Scott Papper, GIA GG, AJP, CM (NAJA), Global Gemology & Appraisals