Swivel ring with a octagonal bezel that on one side displays a historical diamond, and Swivel ring with a octagonal bezel that on one side displays a historical diamond, and on the other an enameled and diamond-set ornament with a transparent ruby pane that shows the diamond’s culet and—when seen from the front—colors it red. The ornaments of the cloisonné enameled hoop were inspired by the mural paintings of the Florence Baptistery.