An 18 Karat Bicolor Gold, Diamond and Onyx Convertible 'Hiroko' Pendant/Necklace, Mattioli, consisting of detachable pendant with removable oval yellow and white gold links containing numerous round brilliant cut diamonds weighing approximately 1.50 carats total together with an oval matte onyx plaque, pendant is suspended from an oval link necklace of graduating size with oversized lobster claw clasp.Stamp: MATTIOLI 750 (Italian hallmark). 56.10 dwts.