proud pearls on rings escaping (too much pride?)

HI,
I am having trouble with proud pearls on rings coming off. They have a
hard life and are pinned in the standard way.
However if worn every day will free themselves after one year. If
anyone has some advice about how to secure a 8mm button/round pearl
that can stand the above punishment please educate me. I am in need of
help concerning techniques and different materials available and what
their properies might be.

Kind regards,

Paul