Georg Jensen Sphere Sterling Silver Amethyst Earrings. 3539280. Sphere - With its perfect symmetry and luminous glow, like a magic crystal ball, Sphere dares us to imagine the future and charms us into dreaming of destinies beyond our control. These elegant sterling silver and amethyst hoop earrings are part of the Georg Jenson Sphere range. The solid hoops of sterling silver and amethyst create a unique accessory. A modern yet classic gift. Please see our website for further Georg Jenson products.