With an alchemical mix of precious metals, stones and mysterious symbols, Codognato jewelry is as elegant as it is morbid Tucked behind St. Mark's Square since 1866, the family-run Codognato jewelry shop has been crafting exquisite, enticing pieces from a vortex of eccentric motifs--Byzantine, Roman and Renaissance-inspired serpent bracelets, cameos and, most famously, skull rings and earrings inspired by 17th-century memento mori images.