Gemma Augustea

The Gemma Augustea (Latin, Gem of Augustus) is a low-relief cameo engraved gem cut from a double-layered Arabian onyx stone. It is commonly agreed that the gem cutter who created the Gemma Augustea was either Dioscurides or one of his disciples, in the second or third decade of the 1st century AD.

The Gemma Augustea is a low-relief cameo engraved gem cut from a double-layered Arabian onyx stone. One layer is white, while the other is bluish-brown. The painstaking method by which the stone was cut allowed minute detail with sharp contrast between the images and background, also allowing for a great deal of shadow play. The size of the gem also made for easier manipulation and a grander scene. It stands 7.5 inches (190 mm) tall with a width of 9 inches (230 mm) and an average thickness of 0.5 inches (13 mm).

It is commonly agreed that the gem cutter who created Gemma Augustea was either Dioscurides or one of his disciples. Dioscurides was Caesar Augustus’ favorite gem cutter, and his work and copies of it are seen from all over the ancient Roman world. The gem is "set" as though in the period c. AD 10–20, although some scholars believe it to have been created decades later because of their interpretation of the scene.

If Dioscurides, or cutters following his example, made it, the gemma was probably made in the court of Caesar Augustus. At some time in antiquity it moved to Byzantium, perhaps after Constantine I had officially moved the capital of the empire there. Augustus, though fully accepting and encouraging cult worship of the emperor outside Rome and Italy, especially in more distant provinces with traditions of deified rulers, did not allow himself to be worshipped as a god inside Rome. If this gem was made during his lifetime (he died in AD 14), it would perhaps have been made as a gift to a respected family in a Roman province or client kingdom. Alternatively, if the gem was made after Augustus’ death, the identity of one or more of the portraits may be different from the usual identification. Another viewpoint is that the gem does portray Augustus as a god in his lifetime, but was cut specifically for a close friend or relative in the inner court circle. Similar issues arise with other Imperial cameos such as the Blacas Cameo in the British Museum.

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