Btw, according to wiki

http://en.wikipedia.org/wiki/Synthesis_of_precious_metals (at the bottom of the page)

The first gold synthesis (granted, it was a radioactive isotope) was in 1924.

I dunno when the first stable isotope synthesis was, but it was probably a long time ago and nothing new.

Extracting gold from seawater is also very real.

But none of those methods are cost effective.

It's kind of like buying the computing power to brute force a bitcoin private key. It's possible, but not worth it.