Princess's Jewels On Show -- The Princess's diamond pictured at a preview at Olympia to-day (Friday). Diamond jewellery presented to HRH Princess Elizabeth on the occasion of her wedding and gifts made to her 21st birthday as well as at other events during her South African tour, take pride of place at the Fair of British Diamonds, a department of the British Industries Fair which opens on May 3rd at Olympia and Birmingham. Also a prominent exhibit is the world's largest diamond - the 770 carat Woyie River diamond - set in a unique flower of which the stone forms the centre. April 30, 1948. (Photo by Reuterphoto).