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 Lava adds grounding and protecrion, and the Selenite bead keeps the bracelet cleansed and charged.