If the US goes back to the gold standard China and the EU loose their shirts.
EDIT: The reserves in tonnes.
United States8,133.52
Germany3,427.83
International Monetary Fund3,217.34
France2,892.65
Italy2,451.86
Switzerland1,290.17J
Japan765.28
Netherlands722.49
European Central Bank719.910
China, Mainland600.011
Spain493.312
Taiwan423.313
Portugal407.514
Russia386.615
India357.716
Venezuela357.417
United Kingdom311.318
Austria307.519
Lebanon286.820
Belgium227.721
Philippines187.922
Bank for International Settlements185.323
Algeria173.624
Sweden155.425
Libya143.826
Saudi Arabia143.027
Singapore127.428
South Africa123.929
Turkey116.130
Greece107.931
Romania104.932
Poland102.933
Indonesia96.534
Thailand84.035
Australia79.736
Kuwait79.037
Egypt75.638
Denmark66.539
Pakistan65.340
Kazakhstan58.6