You are viewing a fine quality 18K yellow gold man's ring made in the 1960's. The ring measures 16 mm or 5/8" long up the finger by 23 mm or just under 1" across. Set in the center on top is a natural 5 carat black Star Sapphire stone. The star has 6 legs. The ring is marked: 18K. It is a size 10 with a thick shank and can be re-sized. The ring weighs 11.3 grams.