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Straight out of London; The Worlds Most Expensive Shirt' The Eaton Diamond was displayed instore at Eton shirts on May 8, 2008 in London, England. To celebrate the 80th birthday of Eton Shirts they have launched 'The Worlds Most Expensive Shirt', The Eaton diamond valued at £23,000 ($46,000 USD). The shirt has seven coloured diamonds that adorn the shirt studs and cufflinks.