Mens Antique Art Nouveau .80 C Diamond Mermaid Ring 18k Yellow Gold. This is a beautiful antique art nouvea ring c.1910 set with .80 Carat old mine cut diamond. The old mine cut is white fiery with an open culet. The ring is designed with two mermaids holding tridents. The ring is in good condition. It test for 18k, Weight 11.6 grams, Widest Width 11mm. It is a large heavy ring could be worn by man or woman, Ring Size 9,