Signet Ring with Black Opal Cabochon for Men silver, gold. Oval Solitaire Ring. Minimalist Luxury Pinky Ring. Vintage Style Signet Ring for Men with Oval Black Opal. Oval Pinky Ring for Men Metal: 925 silver plus 14k gold plating over Weight: 4.5 gr depends from size 1 piece (central stone) - opal Weight 1 ct, oval cabochon cut, black color