An Alchemical symbol with a very deep and complex meaning. Primarily, the Stone represents the Intimate Christ dressed with bodies of Gold. When acquired, this stone gives powers over nature. It is lost when thrown in water (through Fornication). When the stone is dissolved in (sexual) water, then the metallic Spirit is melted, and interior Magnes escapes. It is said when this happens, one dissolves the stone in water on Saturday (Saturn = death). The Philosophical Stone is passes through phases of development: black, red & white. It is also the Cubic stone of Yesod (Parsifal Unveiled), the stone that Jacob anointed with oil and "a Stone of stumbling, a rock of offense." Nicolas Valois: “It is a Stone of great virtue, and is called a Stone and is not a stone.” Thus, this stone in synthesis, is the sexual energy. "The Philosopher’s Stone is the semen. He who practices Sexual Magic every day is working with the Philosopher’s Stone." - Samael Aun Weor, The Manual of Practical Magic