Aventurine is a green quartz that brings luck and prosperity and holds a frequency close to that of the Solar Plexus and Heart Chakras, holding a frequency of 341 Hz.
Amazonite is a good stone for the Heart and Throat Chakras, holding a frequency of 432 Hz. Amazonite provides courage, strength of heart, and loyalty, and supports understanding the communication of others. 
108 Beads
Mala beads are one of the oldest meditation practices in the world. One recites a mantra for each bead they count, counting by touching one bead at a time. The Mala strands here have 108 beads on them, and an end strand so that when reciting your mantra, you know when to switch directions and begin counting/chanting in the other direction of the strand. Traditionally, one is not supposed to cross the center/end bead or bead strand when reciting. Use your thumb and any finger but the pointer to count as you recite.