Antique Art Deco Sapphire & Diamond 18ct Gold RingAntique Art Deco gemstone ring featuring a central blue sapphire alongside two diamonds set in 18ct yellow gold. The ring is hallmarks with the stamp 18ct and PLAT. HALLMARKS The hallmarks are very worn although you can see faintly a 'P' indicating the piece is platinum and 18ct. ERA Art Deco, 1920 1939 MEASUREMENTS The setting of the ring measures 1. 2cm 0. 4" in length, 0. 4cm 0. 17" in height and 0. 3cm 0. 13" in depth. The band of the ring