The piece has been in the royal family for decades with the Queen Mother wearing the brooch during a during a visit with French President Lebrun at Windsor Castle in March 1939.
President Joe Biden on Sunday will join his fellow G7 leaders in backing new conservation and emission targets to curb climate change before he heads to Windsor Castle for tea with The Queen.
A source told The Sun the Queen, 95, has been given a new six-week-old male corgi puppy as a birthday gift by Prince Andrew. It comes after her Dorgi puppy, Fergus, died in May of a heart problem.