Item type:RingMetal: 10KT Black Gold FilledMain Stone: Blue Zircon Stone Material: Cubic Zircon(not crystal or glass)Cubic Zircon Stone parametermineral hardness: 8�C8.5 on the Mohs scale(crystal or glass is about 7)Cubic Zircon refractive index: 2.15�C2.18 (crystal or glass 1.5) (diamonds 2.42)Cubic Zircon dispersion: 0.058�C0.066 (crystal or glass is 0.013) (diamond 0.044)Ring Weight: About 6gRing Size(approx): 6/7/8/9/10Package:1 x Ring