Lava Stone (black) helps you stay grounded and ease your anxiety - you can also dab your essential oils on these natural lava stones! Amazonite (green) helps filter your unnecessary thoughts as well as blocks electromagnetic waves from your phones and other devices from sapping your vital energy. The rainbow crystals coordinate to your 7 energy centers, or chakras, and help to keep them in a healthy balance.  The buddha is telling you to stay in the NOW.  Please see the section on crystals for more detailed information.  This one is 7 1/2".