This ring is not stamped . As to whether it will turn color or not , it will not . As to whether it will turn your finger green is not a simple answer . Please Google " why does my ring turn my finger green " . It explains it better than I can .It depends on body chemistry & many other things . I can tell you that out of over 350 ring I have sold on Listia , I have only had (5) people tell me my ring turned their finger green . I have no way of knowing , but please read my feedbacks . Sorry I can't give you a better answer .