I’ve recently purchased some magnetic clasps. I’ve found that they
work ok on necklaces, but don’t work as well on bracelets – several
customers have asked for “safety chains” because brackelets kept
falling off. Creating your own clasps around the magnets. . . I
supposed if you made the surrounding piece and then glued the magnet
into it it would be ok. Heating the magnet (as in soldering metal
around the magnet) doesn’t work at all, it causes the magnet to stop
being magnetic.
Good luck