Chrysopoeia

Using the Philosopher's Stone, Flamel achieved the transmutation of metals into pure gold
Chrysopoeia was a term used to refer to the transmutation of base metals into gold.
The transformation of common metals into gold or silver was among the best known goals of alchemists, along with the creation of a panacea (a remedy that would cure all diseases and prolong life indefinitely), and the discovery of a universal solvent.Harry Potter and the Half-Blood Prince (film) 
Famed French alchemist Nicolas Flamel, achieved at least two of these three primary goals with his creation of the Philosopher's Stone sometime in or after the 14th century. The stone produced the Elixir of Life, a life extending potion that allowed him and his wife, Perenelle Flamel, to live for well over 600 years until sometime after the stone was destroyed in 1992. The stone could also perform chrysopoeia, although Flamel isn't recorded as having used it for this purpose.
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