Georg Jensen Sphere Sterling Silver Black Agate Bangle. 3530942. 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. This magical sterling silver and black agate bangle is part of the Georg Jensen Sphere collection. The sleek bangle is set with exquisite black agate gemstones to create a contemporary design. The bangle is said to symbolize courage and peace. A perfect gift for any occasion. Please see our website for further and matching Georg Jensen products.