How broken is it? Generally speaking, it can be repaired. Expensive jade beads can be repaired when they are taken to a jewelry store. Ordinary beads, but if you like them very much or are important to yourself, you can use 3M glue. This glue is of good quality. If it's too bad to be repaired, you'll have to throw that bead away! If the chain is too long, cut it a little!