Ah well, I'd say that if the market was free and allowed to find an honest value, almost any gold jewelry could come back onto the market. Physical gold is in strong hands at todays artificially low prices, much of that won't be coming back any time soon.
So what industrial processes use up 30% of the gold? You got my curiosity there.
Well if you have a gold ring, you most likely sell it as a ring, at 300% it's physical value. But I guess that's of how much the prices would rise if you are implying artificially low prices.
I think the largest demand for gold in industry are contacts and switches in electronics, those aren't really dependent, it just happens to be the most sensible material for it.