Who invented the philosophers stone?

Answer 1

The philosopher's stone was a substance created by alchemy. The substance could be used to turn base metals into silver or gold, heal all illnesses and prolong life. It is sometimes referred to as materia prima, or for medical purposes, the elixer of life. Geber, an Islamic alchemist, is believed to have first come up with the concept for the philosopher's stone in the 8th century AD.

Some believe that the philosopher's stone is actually a metaphor for spiritual enlightenment, with our imperfect state (base metal) being enlightened to a more perfect state (gold). Nicholas Flamel

Answer 2

In the Harry Potter Books, the creator of the philosopher's stone is Nicolas Flamel.