While President Trump's state visit to the United Kingdom last week was unprecedented in many ways, the exchanging of gifts is a key diplomatic tradition, and this trip was no exception. WPA Pool // Getty Images King Charles and President Donald Trump with Queen Camilla and First Lady Melania Trump at the state banquet at Windsor Castle. President Trump gave Queen Elizabeth a brooch, the Obamas and Bidens gave Tiffany gifts, the Kennedys gave the Queen a silver Tiffany frame, and when the Reagans went to Windsor for their State Visit, they didn’t give the Queen a Tiffany gift, but did give one to Prime Minister Thatcher. Kate played an important role throughout Trump's state visit to the UK. As royal reporter Victoria Murphy wrote, "President Trump’s State Visit to the UK was the ultimate example of Britain utilizing the soft power of the royal family with a President who has made his admiration for them very clear.