Thank you for that tip, James. I have seen those titanium clamps somewhere before, and it does seem like a good idea, as placement is always a challenge.
I think I used medium solder for the rings. I guess I'll try to protect the bezel itself, and just give it a try to heat and pull. Otherwise, for this one I'll re-fashion it by cutting and sanding.
By the way, the hole will be pretty with a polished labradorite peeking through the heart opening - it is the back, so a secret for my neice, the wearer.