Owl coin Tetradrachmon earrings on sterling silver oxidized with gold-filled filigree decoration, Athena owl necklace, Greek museum replicas. Athena's owl earrings, ancient Greece heritage. A pair of earrings designed by Rafael Santarosa based on the ancient symbol of goddess Athena and therefore her devoted town of Athens. It is the symbol of wisdom and knowledge. On the back side, exactly as the original ancient coin, Athena's head is curved. Made of oxidized sterling silver coin set in a K18 gold filled sterling silver base.