Moonstone vs Swiss Blue Topaz: Which Gem Should You Pick? The choice between Moonstone and Swiss Blue Topaz in gemstone jewelry can be just as stunning as the stones themselves as all of them radiate an astonishing appeal, with beautiful shades and energies that take special care of personal choices and fashion sense. The decision between these gemstones stretches out past essential style and into the domain of individual inclination, history, and pictures.