Diasterism in Rose Quartz: illuminate this polished quartz sphere from behind to reveal a six point star with a center that moves with the light source. The rayed star is form of chatoyancy, where the light is scattered by microscopic parallel crystal fibers that grew within the quartz. This is similar to tiger eye chatoyancy, but here the fibers grew along the three different directions of the main crystal symmetry. Such asterisms are more commonly seen in sapphire and ruby gemstones, but can b