2 Gothic cast metal rings Could be Sterling Ster

A pair of gothic-themed rings. One features a cluster of multiple skulls in a tiered arrangement, cast in a silver-toned metal with dark antiqued patina. The second ring depicts a ram's head with prominent curved horns, showing a dark, iridescent metallic finish. Both rings show signs of wear, surface oxidation, and tarnish. One ring bears a partially obscured mark, possibly '10'.