Watch: Kate Middleton dazzles in Hyderabad Nizam diamonds

New Delhi: The Duchess of Cambridge glammed up for her first official night out of the year tonight - with a diamond necklace borrowed from the Queen. Looking stunning in the same midnight green Jenny Packham gown she wore to a dinner in October teamed with the enormous diamond necklace, Kate mingled with 430 guests including Liz Hurley, Olympic Gold Medallist Katherine Grainger and cross-dressing artist Grayson Perry. But it was the Cartier diamond known as the Nizam of Hyderabad, given to Queen Elizabeth II in 1947 for her wedding to the Duke of Edinburgh that had tongues wagging. Watch in pics The Duchess of Cambridge dazzling in Nizam of Hyderabad diamonds: Then Princess Elizabeth, she was gifted the necklace along a with a tiara from the King's priceless collection.And last night Kate, patron of the gallery, looked a million dollars as she chatted to guests, who paid £600 each for their tickets.The evening celebrated the work of acclaimed authors who have written special "pen portraits" to be sold to raise money for the gallery.Kate Middleton, talks with artist Grayson Perry during The Portrait Gala 2014 at the National Portrait GalleryKate Middleton arriving at the National Portrait Gallery for The Portrait Gala 2014: Collecting to InspireKate Middleton arriving at the National Portrait Gallery for The Portrait Gala 2014: Collecting to InspireKate Middleton arriving at the National Portrait Gallery for The Portrait Gala 2014: Collecting to Inspire