The missing Monaco diamond from the 2004 Jaguar F1 crash

A diamond valued at $300,000 was last seen attached to the front of a Jaguar Formula 1 car before it crashed on the first lap of the 2004 Monaco Grand Prix, and it has never been found. The gem was part of a promotional tie-up with the film Ocean's Twelve, which was being shot in Monte Carlo at the time.

Jaguar Racing had struggled on track since entering F1 in 2000, and its parent company Ford had decided to withdraw from the sport. Former team principal Tony Purnell described it as the worst year of his life, as the team was being sold or faced closure. Communications director Nav Sidhu arranged the film partnership and a deal with diamond company Steinmetz to attach gems to the two cars.

The diamonds were hand-delivered to the garages during the race weekend, and one was to be mounted on each car. Its whereabouts remain unknown more than 20 years later.