The skulls in the Grizzly Love Jewelry Collection are modeled after the Tibetan prayer beads used in a form of a Buddhist mala. They originated as a tool for contemplating the meaning of life and death during meditation. 

Skulls a traditional represention of death in Tibet, were incorperated by Buddhists into malas to represent the impermanence of life and the limits of human knowledge, beckoning for reflection upon the inevitability of death and the necessity of embracing lives filled with compassion. All sounds good to me!

Traditionally these beads are carved from yak bone to re-emphasize the skull's symbolism. It is also said to honor the beasts of burden that serve mankind and to inspire devotees to likewise serve their fellowmen. That said - I try to remember that I can't serve anyone else unless I am serving myself. Selfish as it may sound many a story will reiterate the same.