While Queen Elizabeth always wore a tiara to White House state dinners, it is worth remembering that while Camilla is also a Queen, her position is different. Camilla is not a sovereign Queen; her husband King Charles is the one who is head of state.

The Queen has sported two significant pins so far during the diplomatic trip

Queen Camilla has chosen three historically significant brooches in the first two days of the U.S. state visit, including the Cullinan V diamond, a Cartier Union Jack-Stars and Stripes pin, and the Queen Mother's Art Deco brooch.

Part of a larger set, the amethyst and diamond piece once belonged to Queen Victoria.

Queen Elizabeth sported a royal headpiece during her 2007 state visit to the U.S.A.

Queen Camilla selected a striking piece of royal jewellery for King Charles's address to Congress this evening, fastening the Queen Mother's Art Deco brooch to her outfit. Buckingham Palace confirmed the Queen wore an Anna Valentine cream coat and dress featuring black detailing for the occasion.

King Charles III and Queen Camilla land for their first state visit to the U.S. on Monday. The British royals will meet with President Trump and Melania Trump at the White House for a garden party.

King Charles III will embrace some of Washington’s most formal ceremonial trappings as he tries to emphasize a bond between the United Kingdom and the United States that is so strong it can withstand the political turmoil of the moment.