ROMAN HIGH KARAT GOLD RING WITH PLASMA STONE Ca. AD 100 - 300. A gold ring with a round D-section hoop that tapers at the base and widens at the shoulders to form a high bezel, securing a green plasma cabochon. Size: D:4.6mm / US: 6 / UK: L 1/2; Weight: 15.4g Provenance: Private UK collection; From an old British collection formed in the 1990s.