[s_wilwerding]

You know who's very good at making rings - dentists. You make a ring in much the same way you make a gold crown. You start with the ring (or crown) in wax. You then make a plaster cast of the wax with a hole leading to where the wax form is. Then you put the plaster cast in an oven, which melts the wax, which can then be poured out the hole. You then put the plaster cast on the end of a centrifuge, put the crucible full of whatever metal you use (tooth gold actually works quite well) in the centrifuge, and spin it, which forces the liquid metal into the mold. You let the mold harden, break off the plaster, and polish the ring.

My father (a dentist) helped me make a simple band with a V in the middle for one of my girlfriends. So, if you have any dentist friends, I bet they could help.