"The Ring" (acually six of them in different sizes) in Peter Jackson's The Lord of the Rings trillogy was/were made here at Jens Hanson Gold & Smilversmith, at the corner of Church Street and Selwyn Place, by father and son, Jens and Thorkild. Jens passed away in 1999 before the film was released. They also made the Air New Zealand Cup, the revamped rugby National Provincial League, but this another time.
The lettering on the rings were all CG; you can buy "The One Ring", sans the writing.
We will be in Auckland for a week.