To be honest, I think the central banks fiddled a little with the price of gold and silver, especially when they gave it a whack in mid May at a critical juncture.
But after all, that's their job. Otherwise, I think the rally in stocks has been genuine. And the drop in oil prices is genuine, too, although it may have been kicked off when Goldman Sachs adjusted their energy index fund on the precise day when energy prices began to fall, by decreasing the unleaded gasoline component by a large amount.
Again, that's their job, and it wouldn't have stuck if energy prices didn't want to come down from their speculatively high levels.
Goldman Sachs were the only major trading house hyping T. Boone Pickens' "$100 a barrel for oil" schtick. Your little bit of information makes it clear that they were doing a pump-and-dump.