Black Agate 925 Solid Sterling Silver Antique Design Ring. The Top Of The Ring Measures 1/2 Inch In Length. This Lovely Vintage Style Ring Is Set With One Genuine 10 x 8 mm Black Agate Stone. Inspired By The Original Designs Of The Victorian To The Art Deco Period, 1836-1935. Item Is Stamped 925. Our Silver Is Genuine 925 Sterling Silver.