Top Left: Silver Tetradrachm of Athens (ca. 449-448 BC), with the owl of Athena facing forward. Set with cabochon sapphire. 

Top Right: Silver Tetradrachm of Ephesos (ca. 360-350 BC), with the bee of Artemis facing forward. Set with cabochon sapphire. 

Bottom: Silver Tetradrachm of Entella, Punic Sicily (ca. 389-300 BC). Set with cabochon sapphire.