i have this same ring. its sterling plated. from avon. not real but really is beautiful! it does change after constant wear. i was told it was sterling too and it tarnished and it wouldnt come clean so i took it to a jewelry place and they said it was just plated and the tarnish is permanent unless taken to have recoated in silver or rhodium. quite a costly thing to do so its just sitting in my jewelry box collecting dust.