Jessica Nasr, a staff member of Dubai-based jewellery firm Mouawad holds the 637-carat "L'incomparable necklace", featuring the world's largest internally flawless diamond dubbed "The Golden Giant" and valued at 55 million USD, at a media event in Singapore on October 4, 2013. The necklace has been awarded the title of "Most Valuable Necklace" in the world by the Guiness World Records. AFP PHOTO/ROSLAN RAHMAN (Photo credit should read ROSLAN RAHMAN/AFP/Getty Images)
