Gold contrary to popular belief is not a finite asset. Gold on Earth my be finite but the universe constantly creates (super nova) and destroys (black holes) gold.

Very tangential but recent research suggests that very little gold is created in supernovae, the vast majority has been created in a much rarer event: the collision of neutron stars. Both do of course continue to this day so it doesn't really affect your point.

And in a practical sense, if we ever start mining asteroids (could happen within the next few decades), gold will become practically abundant on Earth along with other metals which are presently rare.