The diamond was planted on the nose of the Jaguar R5 at Monaco (Getty)
I was at the 2004 Monaco Grand Prix when Jaguar Racing were joined by Hollywood stars George Clooney, Brad Pitt and Matt Damon to promote their forthcoming movie, Oceans 12.
Jaguar also teamed up with Steinmetz Diamonds, planting a £140,000 gem into the nosecone of Austrian driver Christian Klien’s car. But when Klien lost control and hit the barriers early in the race, the diamond was also lost.
According to a team statement from PR boss Nav Sidhu on CNN, someone made away with a very valuable keepsake.
"We may not have got the best result on the track this weekend, but we have certainly left our mark in Monaco by adding to the glamour. Somebody here is going to walk away with more than just a normal motor racing keepsake. I don't expect we are going to get it back at all but we were prepared for this otherwise we would never have done it."