Hardness: 8.5 Quality: AAA Color: clear - White Clarity: Flawless Shape: round Size: 6.00mm Diamond Equivalent: 7/8 Carat Origin of rough material: China Cut, Facet, and finished: China Specific Gravity: 5.65 Refractive index: 2.15-2.18 Polish: Excellent Dispersion: .058-.066 Crystal structure -- Isometric (cubic) Chemical composition: YTZRO2 - Modified Super CZ