Gem

Sommerville: Red Jasper. Diadumenianus, twenty-seventh Emperor of Rome. Marcus Opilius Antoninus Diadumenianus was son of the Emperor Macrinus. The latter on beginning to reign, A.D. 217, conferred the title of Caesar on his son and associated him with himself in the government. On this account Diadumenianus is sometimes reckoned among the emperors, and in some of the medals issued by him he is styled Augustus. Father and son, however, after less than a year, were overthrown and put to death by Heliogabalus, A.D. 218. Greek and Roman Cameos, Case Z.

Vermeule: Cameo. Red Jasper [Unmounted] Draped cuirassed bust of a roman youth facing right. "Diadumenianus" (AD 217-218) Neoclassical, probably copied from coin portraits of that Caesar.