The man-made answer to natural diamonds, cubic zirconia boasts perfect structure, extreme hardness and incredible light dispersion. made with only the highest quality, inclusion-free rough, preciosa Cubic Zirconia is cut to a variation tolerance of +/–0.01mm and every facet is individually polished to give these stones an even brighter fire than their naturally occurring counterpart.
Chemical composition: ZrO2 +Y2 O3 Structure: cubic Hardness (Mohs’ Scale): 8.5° Density: 5.9 g/cm³ Refractive index: 2.17 Heat resistance: 600 °C/1,112 °F Heat resistance of White cubic zirconia: 2,000 °C/ 3,632° F Heat resistance of Black cubic zirconia: 300 °C/ 572 °F