// BBC WORLD NEWS — MONDO
Whatever happened to the $300,000 diamond that went missing in F1 crash?
Where were you between the hours of 1pm and 3pm on 23 May 2004?
If you were in Monaco, consider yourself a suspect - or at least a witness - in Formula 1's biggest unsolved mystery.
A $300,000 diamond was last seen stuck to the front of an F1 car before it crashed on the first lap of the Grand Prix and it still has not been found 22 years later.
Did someone pick it up? Was it swept up with all the debris? Did it slip down a drain? Was it even a real diamond?
The reason why a 1.4 carat diamond was attached to the most delicate part of a car that reaches 200mph in a race was straightforward: publicity.
Jaguar Racing's results on the track had been mediocre at best since becoming an F1 team in 2000 and by 2004 its parent company Ford had decided it would be pulling them out of the sport.
"My job flipped from primarily running the team to primarily selling the team and finding a new owner or they would shut it down," former team principal Tony Purnell tells BBC Sport.
"It was probably the worst year of my life. Particularly because for the first few months I was sworn to secrecy."
His team needed some good PR to divert attention away from performance and improve its appeal.
They had enjoyed a successful promotional weekend in Silverstone the previous season thanks to a tie-up with Terminator 3 and so director of communications Nav Sidhu was looking to recreate the magic with another bit of help from a movie.