I came across this through Gizmodo today.
The Untold Story of the World's Biggest Diamond Heist
Holy crap! This story is incredible. It's told to the reporter by the mastermind of the heist, who is doing 10 years in a Belgian prison for the crime. Truly an example of truth being stranger than fiction, this guy weaves a hell of a yarn:

In February 2003, Notarbartolo was arrested for heading a ring of Italian thieves. They were accused of breaking into a vault two floors beneath the Antwerp Diamond Center and making off with at least $100 million worth of loose diamonds, gold, jewelry, and other spoils. The vault was thought to be impenetrable. It was protected by 10 layers of security, including infrared heat detectors, Doppler radar, a magnetic field, a seismic sensor, and a lock with 100 million possible combinations. The robbery was called the heist of the century, and even now the police can't explain exactly how it was done.

I highly recommend you read this if you have the time. Personally, I can't wait for the movie version!

"It is easier to stay out than get out."

Mark Twain (1835 - 1910)