Thanks for sharing the picture. That helps a lot!
You can either:
1. Put tape around the lace part of the bezel. If you do a good job and make sure it is secure all the way around, your resin won’t run out. (I like to use good quality masking tape.)
2. If these are a standard size, like 1 inch wide, you can always make the resin cabochons in a mold, then glue them into your bezels after demolding.
Let us know how it works out!