Were there 108 of the same kind of beads and one other bead that was different from the others on your necklace? When doing chants on a mala or prayer beads usually there is typically one larger bead included to allow the fingers to keep track of doing 108 chants without having to look at the beads while deeply engaged in meditation.
All prayer beads have 108 plus one to start the cycle again. They tell you there are 108 beads but in actuality there are 109. If you are using it to pray the extra bead becomes rather useful for keeping track of the mantras required when you take vows.