[huthuthike]

https://en.wikipedia.org/wiki/Rai_stones

In Micronesia there was a practice of carving massive "coins" out of stone. These "Rai stones" were often too large to move. Yet individuals could "own" them and they were traded often for things of great value. I believe I even read an account of one that had sunk in a shipwreck, but the owners went on to trade it even though it was at the bottom of the sea.

Just cause a physical item cannot be possessed physically doesn't mean it is valueless.

However, for gold specifically, part of what makes it valuable is that it has some manufacturing uses and people like making jewelry out of it. There is no doubt a much larger supply of gold throughout the universe than on earth and it has no effect on the price here.

So I think while you can buy and sell gold on another planet (provided people can widely agree on it's transfer of ownership), that would be a completely separate market from the terrestrial gold market.