... ball bearing etc High technical strength Excellent transmission Sapphire/Ruby Jewel BearingGeneral DescriptionOur company have specialised ... manufacture of Jewel bearings Synthetic white corundum, ruby, sapphire, glass, microcrystalline glass, cubic zirconia, natural agate ... of precious stone bearings: synthetic white corundum, synthetic sapphire and ruby bearings, crystallite glass, cube zirconia, ...