Inside the Monaco Grand Prix 'Diamond Heist' 20 years on: How Jaguar's Ocean's Twelve publicity stunt led to the disappearance of a £140,000 jewel... and it's still missing to this day

The glitz and glamour of Monaco, Hollywood movie stars, high-octane racing and a cluster of $250,000 diamonds… It sounds like the plot sketch for a blockbuster heist movie.