Ancient engraved gems (from the Latin gemma, “precious stone”) are small reliefs inscribed into semiprecious stones (generally chalcedony, carnelian, agate, onyx, or hematite), rock crystal, or glass, depicting portraits, mythological figures and scenes, and often inscriptions or magical symbols (Character). Because they often show the legendary creature known from gnosticism, the so-called Abraxas (or Abrasax), with armored body and a cockerel'…