Art Deco Sterling Onyx and Marcasite Ring

Art Deco sterling silver onyx and marcasite ring; the simple elegant design is rectangular black onyx stone set into a rectangular frame with slight concave sides. The onyx is edged with a row of bead set marcasites. Signed '925' on the inside of the plain sterling band. Size: 7/8" x 1/2" across the top, size 9 Condition: Very good