Hi Tess ! We have been using magnetic clasps for a couple of years.
They are a God send for older ladies who have difficulty
manuevering. They are especially useful for bracelets.
We have noticed that people tend to PULL them apart when taking them
off so we try to educate them to slide them apart. The magnets are
so strong that pulling them apart can sometimes result in bead tip
We have had very few problems with them inspite of having used
several hundred clasps. In one case the glue holding the magnet in
its casing failed. In another instance heat from my torch seems to
have affected the strength of the magnet.
Rio is a good source of the clasps, They come in a variety of
configurations and metals.
We suggest that you not use them on high value pieces until you are
confident that the clasps you are using are reliable for your
applications. Obviously you should be apprehensive about using them
to hold very heavy items together.
Once you start selling them be prepared to have a lot of restringing
work come your way…Regards, Ron Mills at Mills Gem Company, Los