1940'S SAPPHIRE CABOCHON DOME SIGNET RING The radiating motif features a cabochon sapphire set in round and navette diamonds. It rests on a curved ring in 18K yellow gold pierced with volutes. French work. Gross weight: 12.04 g. Finger size: 50. Weight of the cabochon sapphire: approx. 4 carats. A diamond, sapphire and 18K yellow gold ring, circa 1940. French assay mark. Gross weight : 12,04 gr. Size : 50. Sapphire weight : 4 carats approx.