We’ve known how to turn lead into gold for ages, you just add a couple of protons, neutrons, and electrons. Long story short: Uses a fuckton of energy, not worth it.

Fun fact: When Ernest Rutherford and colleagues put together the first paper about their findings they avoided the word “transmutation” like the plague. It has been considered impossible since before alchemy became chemistry and even though he was publishing in physics chemists would probably still have had his head.