Some say the Mala Bead or Meru Bead which in translation means Mountain Bead, is the 109th bead of the Mala necklace. However, the Guru is not counted as part of the 108 beads. Traditionally used in Mala jewelry, the Guru signifies the end of one round in the prayer circle. 

The Guru Bead is not just to complete the prayer circle of your necklace, it is your teacher, and is said to hold your prayers and intention.