... High technical strength Excellent transmission Sapphire Jewel Bearing/ruby jewel bearing/jewel bearingGeneral DescriptionOur company have ... in the manufacture of Jewel bearings Synthetic white corundum, ruby, sapphire, glass, microcrystalline glass, cubic zirconia, natural ... stone bearings: synthetic white corundum, synthetic sapphire and ruby bearings, crystallite glass, cube zirconia, nature agate ...