Top Right: Silver Tetradrachm of Ephesus (mid 4th Century BC), with bee. Set with a cabochon sapphire. 

Top Left: Silver Tetradrachnm of Alexander the Great (ca. 325 BC). Set with cabochon ruby. 

Bottom: Silver Nomos of Tarentum (end of the 4th Century BC), with the god Taras riding a dolphin. Set with four cabochon sapphires.