I made these rings in class. This one I carved out of a ring that I molded, cast it in bronze and then lined the inside with some silver foil, that i soldered in place, the process was pretty easy, and I will try a few different styles soon.
This is the first version of this rin, I love how it looks, but I need to re-do the base. Inside there are bands which I thought I needed for fit, but I'm afraid they will tarnish and be auncleanable, by the average person. So i will try it again... It is also VERY large, as you can see below on my finger, I may just use the smaller cage for the rings. I'm also going to carve a large dome ring, hopefully with a springy band inside that will make the ring fit on any finger, within a few sizes... we'll see.