This design can be made any size by simply adding or taking out lave beads. The beads chosen to represent the chakras are: 
Crown(purple) is Amethyst, Third Eye(indigo) is Lapis Lazuli, Throat(blue)Kyanite, Heart(green) is Green Jade, Solar Plesus(yellow) Yellow Jade, Sacral(orange) is Chalcedony, Root(red) is Red Choral.
The Black Lave adds the element of grounding and protection, and the Selenite bead helps keep the bracelet cleansed and charged.