Each 15.5" strand is composed of seven different stones used to represent the seven energy points in the human body. Used in Reiki and religious practices, the order runs from the base of the spine and moves all the way up to the top of the head. Each stone represents a different Chakra:
Crown (amethyst), third eye/brow (enhanced lapis lazuli), throat (sodalite), heart (green aventurine), solar plexus (tigers eye), sacral (yellow jade) and root/base (red jasper). Some stones may have inclusions or natural pitting. This listing is for one randomly selected 6mm strand. I also have these available in 8mm.