Hi, Bree -
The critical factor in terms of security is using a two-step epoxy, rather than a cyanoacrylate glue. A two-step epoxy will bond the pearl & the metal peg on a molecular level, which is an excellent thing. The longer the time it takes the expoxy to set up (anywhere from 5 minutes to 8 hours), the stronger the bond. Just make sure both surfaces are clean before expoy-ing them.
The length of the peg doesn’t really come into play here.
Kind regards,
Mary Stachura
www.StachuraWholesale.com