... etc High technical strength Excellent transmission Sapphire/Ruby Jewel BearingGeneral DescriptionOur company have specialised in ... the manufacture of Jewel bearings Synthetic white corundum, ruby, sapphire, glass, microcrystalline glass, cubic zirconia, ... Performance area):Type of precious stone bearings: synthetic white corundum, synthetic sapphire and ruby bearings, crystallite glass, cube ...