Synthetic gemstones uncut corundum raw material unpolished lab created blue sapphire is for your jewelry fashion design.The highest quality raw cubic zirconia uncut synthetic gemstones from China manufacturer,rough stone weights are not exact and it is very heavy.Blue sapphire rough material  will cut nice stones with great dispersion, its cheap and affordable prices. Man-made sapphire crystal is 9.0 Mohs's scale for hardness(the third hardest mineral, right behind diamond at 10 and moissanite at 9.25), density is 3.98-4.1 , refractive index is 1.761–1.769, dispersion is 0.015–0.018, heat resistance is 950°C - 1000°C.