I'm going a bit away from precious stones/metals but I would expect seashelves to retake their full place as currency in Africa. I would also expect salt to become again one of the most precious stone in many places.
If it goes to precious metals, I don't think gold will remain valuable for long (except for jewelry) as there is not enough gold and it is almost useless outside of a stock exchange system. As it was the case up to the 19th century it will more possibly be replaced by silver and copper.
Just a simple question: how many people hold some significant amount of gold?
Still today, about every family (extended ones I mean) hold some silver dishes (plain or not), some brass or copper piece of arts...
One last thing. I would also expect steel to quickly become highly valuable.
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