Ca. 200-300 ADA finely carved carnelian intaglio bearing a young male bust behind a bust of bearded old male, both in profile facing left, possibly co-emperors Macrinus and his son Diadumenian who rose to power after the death of Caracalla in 217AD. The intaglio is set in a heavy, possibly later gold ring of a round hoop with wide faceted shoulders. The item has undergone X-ray fluorescence analysis to confirm the metallurgical content suggesting its ancient origin and lack of modern trace elements.Size: D: 18.8mm / US: 8 7/8 / UK: R 1/2; 9.47gProvenance: Property of a North London gentleman; previously acquire on the UK/European art market in the 1970s.