Can I hand out beads from a necklace of fireball?

My character currently has a necklace of fireball with 4 beads remaining. Can I split the necklace and hand the beads out to my party for individual use, or does the necklace have to remain whole until just before a bead is thrown? We are about to fight a difficult enemy, and the idea of bombarding it with 4 fireballs in the first round is quite appealing