8 of Diamonds (2006)

Three thieves scheme to steal a flawless 20-carate diamond worth $2 million. But as their plan unfolds, everything begins to fall apart. The rock is swallowed by a man who then dies, leading to a gruesome amateur autopsy. Also, significant others and fellow criminals resort to blackmail to get a piece of the action, and all three men fall victim to rampant paranoia.