Iron slave collar, Roman, fourth-sixth century CE. The inscription says "I have run away; hold me. When you return me to my master, Zoninus, you will receive a gold coin (solidus)." Going in Ancient History and Archaeology
Cartier has nothing on these guys, Roman Gold Ring, having a wide shaped band supporting a large 3 tiered square bezel inset with a emerald, surmounted by granular decoration, dating to the Century AD.