Queen Elizabeth II of the United Kingdom wears the King Khalid Necklace (with the Antique Girandole Earrings) for a banquet during the Group of Eight summit at Gleneagles, July 2005; more on the necklace over here!

Queen Elizabeth II of the United Kingdom wears the necklace (and coordinating earrings) from a suite of gold and diamond jewelry given to her by King Hassan II of Morocco for a dinner held the night before the wedding of the Duke and Duchess of Cambridge, April 2011

Queen Elizabeth II of the United Kingdom wears the necklace from the Emerald Tassel Suite (as well as the coordinating earrings and the Moss Agate Brooch) as she prepares to sign a guest book at Winfield House in London, May 2011; more on the necklace here!