Hello Al,
If you use the hybrid dopping method, pushing the stone into slightly warmed and fluid wax and then gluing the stone to the unique depressions thus created, about any CA glue should work. Some folks feel that the glue is water soluble and paint the joint with clear nail polish to protect it from moisture. With this procedure, if the stone does pop off, it is easily reglued in the exact same position, as the wax creates a unique “keyed” footprint. I hope this will work for you. royjohn