The plan, which was funded and planned by unknown crime bosses, involved two burglars, Craig Calderwood and Aman Kassaye, who hired a professional make-up artist to use latex effects to make them look like much older men. The two "old men" then waltzed into the Graff Diamonds store, pretending to be high-rolling businessmen presumably shopping for their wives, their mistresses, or a Ma$e video. When the diamond cases were opened, the two men pulled out their guns and demanded the clerks clean out the drawers of approximately $65 million in jewels -- making it the biggest gemstone heist in British history.
Not counting, of course, jewelers robbing their customers every day.
Of course, actually getting away with your loot is the most important part of any robbery, and that's where the duo's mob connections came in. When police tried to reach the scene, they found that several hired vehicles had been inconveniently parked in a way that completely blocked access to the store. The mob had essentially built a wall of cars to cordon off part of the city, giving the diamond bandits a pretty strong opportunity to get away clean. The thieves immediately seized the chance to crash their getaway car into a London taxi cab. (Note: Even sophisticated real-life criminals are kind of stupid.)