Skulls Eternity Band Ring Sterling Silver Size 12 US

Brass / Gold toned colored skull ring Sterling Silver w/ Gold/Bronze color to it. US Size 12 "Sterling" stamp "(c)" stamp "P. luria" ?? Please let me know if you can tell the brand from stamp. I cleaned it and it got more silvery - see first picture. Big! Unisex. This is probably a man's ring due to size, but it was my moms she was original owner.