It's a very ambitious endeavor to try to solder a bezel on to a married metal piece. Every time your piece is reheated the solder may move, leaving gaps between the slices.
After my ring was joined I added the bezel and got gaps- but someone encouraged me to try and fix it, and I'm glad I I did! I melted off my bezel in the process, but replaced it with a larger one. In the end it was a lot of work, but I excelled in all of the troubles! If only life could be that simple, huh?
Here's the ring I ended up with:)