Genuine Black Agate .925 Solid Sterling Silver Art Deco Design Ring. The Top Of The Ring Measures Nearly 3/4 Inches, 18mm In Length. This Antique Reproduction Classic Beauty Is Set With One Genuine 15 x 9mm 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.