Wikipedia - A pyramid is a structure in which all of the outer surfaces (excluding the base) are triangular and converge at a single point. The base of a pyramid can be trilateral, quadrilateral, or any polygon shape, meaning that a pyramid has at least three triangular surfaces (at least four faces including the base). The square pyramid, with square base and four triangular outer surfaces, is a common version.A pyramid's design, with the majority of the weight closer to the ground, and with the pyramidion on top means that less material higher up on the pyramid will be pushing down from above: this distribution of weight allowed early civilizations to create stable monumental structures. For thousands of years, the largest structures on Earth were pyramids: The Great Pyramid of Khufu in Egypt is the tallest pyramid in the World although the largest pyramid by volume is the Great Pyramid of Cholula, in the Mexican state of Puebla. Sean - A gemstone pyramid is an extremely powerful tool, which similar to obelisks (which are topped with a four sided pyramid) draw energies through the base from the place they are situated and focus them out through the point. As such they are very useful tools for removing unwanted energies, and also for generating desired energies and programmed intentions into a space. The energy generated is defined by the particular gemstone from which they are made. Because of this they are excellent cleansers of spaces and of other gemstones, and can be used in healing to extract unwanted blockages and ailments from the body upon which they are placed.