While the ease of a glued bell cap might be enticing, might I
suggest something a little more supportive. Either drilling small
holes into the tops of the stones and using posts with or even
without the caps or some kind of frame. Even wire wrapping.
My wife has an obsidian that I cut in virtually the same manner in
1967. It is still in the very same bell cap with the very same glue.
It hasn’t been worn since 1970 when my mom passed away. I try to stay
far away from that today. Opals are far more valuable, even if you
feel like you saved a lot of money doing your own work. Don’t give
that work away by taking the “easier, softer way” at this point.
Bruce D. Holmgrain
JA Certified Master Benchjeweler