Pyramids: Pyramids bring the stability of four equal sides on a base much like the square but in with the sides angling inward and upward to meet in a point.  This gives them the unique ability to tightly focus energy upward through the apex, making them excellent stones to draw off negative energies and clear blockages while at the same time replenishing light and colour.  Pyramids can be created from most stone specimens in the lapidary although some crystals such as Aphophyllite grow naturally in pyramids.