Magical pendant, 3rd - 4th century AD (gold & heliotrope)

The outer edge of the plain bezel with a fringe of granulation, a suspension loop above, the flat oval stone engraved with Chnoubis, the lion-headed serpent with a coiled tail, the head within a rayed nimbus, a Greek inscription naming the deity, XNOVBIC, dispersed between the rays, a crescent and star in the field to the left, all enclosed within a line border and an inscription, IAWCABAWTHABPACASMIXAHLEW, a series of magical names including Iaw, Sabaoth, Abrasax and the archangel Michael, followed by "I am," the convex reverse with a two-line inscription, OVPIHL COVPIHL, for the two archangels Uriel and Suriel, framed by stars, with an off-center perforation