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1. Copy your save to a jump drive.
2. Get into a Co-op game with a friend.
3. Drop whatever you wanna duplicate.
4. Wait until your friend picks up everything you've dropped.
5. Dashboard (for 360, for PS3 go to the home screen)
6. Copy the save from your jump drive and get your stuff from your friend.
7. Repeat, profit?
Tips: Don't do this with diamonds. Instead use champagne. And while it'll take longer to get the diamonds, you won't lose them (which happened to some of the diamonds in the making of the video) and you also get XP.