Platonic geometry 7 pc set - solid geometry set 1. Tetrahedron (4 triangular faces - representing the fire element), 2. Cube or hexahedron (6 square faces - representing the earth element), 3. Octahedron (8 triangular faces - representing the air element), 4. Icosahedron (20 triangular faces - representing the water element), and 5. Dodecahedron (12 pentagonal faces -representing the ether/aether or universe element). 6. Sphere (representing unity, completeness and wisdom of creation) 7. Merkabah (8 pointed star- two tetrahedrons) Cut from 100% genuine Indian gemstone. 7 piece set of cut geometric shapes. Each piece measures approximately 12-16 mm average size. Fits perfectly in your palm or pocket and easy for traveling!