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
Rainbow colored CZ tennis bracelet
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.
The natural form of cubic zirconia was discovered in 1892. Synthetic CZs weren't invented until the 1930s. They would later be mass-produced and introduced to the jewelry marked in the 1970s.
CZs weigh approximately 70% more than diamonds of the same size and proportions.
Cubic zirconia engagement ring
All photos courtesy of Scott Papper, GIA GG, AJP, CMA (NAJA)