This amoeba like biomorphic ring is betwee a 10.5 and 11 ring for a good sized finger. It is marked 925 and has a black patina inside the holes for a show effect. This has age appropriate wear and came from the estate of a collector of mid century silver in NYC. ( I was lucky to buy quite a bit from his niece.) I am unsure of the country of origin, America, Finland, Sweden, Scandinavian, Norway, Denmark.