It is an American-made piece from 1950 crafted from 14-carat yellow gold, diamonds, and moss agate.
The brooch was a gift from former US President Barack Obama, and his wife Michelle when they visited the United Kingdom in 2011.
Queen Elizabeth wore a printed dress during her meeting with Trump, and the pin looked ideal as an accessory for it in addition to maybe reminding people of a better time when The U.S. had a more capable Commander in Chief. That day, she wore the brooch the Obamas gave her on their last visit to England.
When the queen welcomed the president and first lady to Windsor Castle, she wore a diamond palm leaf brooch.
The Queen was also twice pictured wearing the next brooch, one apparently worn by the Queen Mother, Elizabeth, Bowes-Lyon, in the iconic photo "Three Queens in Mourning", during the state funeral for King George VI.
The third and final piece of brooch-shade is in the form of the one she picked out to wear during the tea. The day he arrived, the day of the banquet, and the day she actually met him for tea.
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In an impressive, lengthy thread, the woman, named Julie, shared the subtle dig Elizabeth may have been making. But while we've all gone over the meeting with fine-toothed comb looking for the one egregious, minute break of royal protocol that will finally bring the Trump Presidency down in a flaming wreck, there's one tiny detail you may have missed.
'The commonwealth country and one of the UK's greatest allies.
The Queen was given the sapphire brooch from the Canadian people to mark her sapphire jubilee during an event in London celebrating 150 years of the Canadian Confederation in 2017.
The Queen's snowflake brooch features 48 sapphires mined from Canada's Baffin Island.
Inside Edition asked Buckingham Palace if was deliberate, but a spokesman said they don't "comment on personal jewelry".
The brooch gifted by the Obamas to the Queen.
Saturday's engagement is the first time that the Queen has been photographed wearing the brooch since it was gifted to her.