Antique Ruby Rose Cut Diamond Enamel 18K Yellow Gold Ring. This is a beautiful and rare original antique ring c.1920. The ring is set with a natural ruby and 18 rose cut diamonds. The ruby is an old cut cushion shape it has amazing color and clarity gem quality. The black enamel is laid on interwoven gold. The ring is in excellent condition. Ring Size 7, Weight 4.0 grams, Face of the ring measures 11.5 mm.