You need only a few things to make this ring:
- Copper pipe. 3/4" pipe makes approximately a size 9 or 9.5 ring.
- Something to cut copper pipe. I use a pipe cutting tool, but a hacksaw would probably work.
- Something to remove sharp edges. Sandpaper, a file, or a dremel should work.
- Something to polish the ring. You could try several grades of very fine steel wool, or fine sandpaper, followed by a polishing cloth, or a dremel.