This beautiful 7 piece Amethyst set contains the Platonic Solids found within Sacred Geometry. Each one resonates with the 7 main chakras. 
Cube = Root
Icosahedron = Sacral Chakra 
Tetrahedron = Solar Plexus 
Merkaba = Heart
Octahedron = Throat
Dodecahedron = Third Eye 
Sphere = Crown