The mala is made from Tibetan Turquoise. Turquoise from the Himalayas is remarkable for it's quality and hue. The guru bead and spacers are Tibetan snow crystal, one of the most rare crystals in the world. It can only be found in the Himalaya's in altitudes between 18,000 and 23,000 feet. The beads are 10 mm.
In Tantric Buddhism malas have 108 beads used to count mantras one mala counts as 100 and the eight extra are to be dedicated to all sentient beings the practice as a whole is dedicated at its end as well. Some practices suggest that you use a certain kind of mala for counting the chants that are part of that specific practice. Many people like to wear a mala on their wrist, which should always be on the left hand.