Jens Hansen designed and made The Movie Ring for the Lord of the Rings and The Hobbit trilogies. We also designed and made the silver chain worn by Frodo Baggins and Vilya, ring of Elrond.
We did not make any other ring or jewellery for the movies. However, we have created our own version of the rings worn by other elven characters from descriptions given in the books. We call these "Elvish Inspired Character Rings".