During her final appearance on the Buckingham Palace balcony on Sunday, the monarch wore a black mourning pin which she placed at the front and centre of her hat.
WATCH: The Queen appears on Palace balcony at the end of the Jubilee Pageant
The 96-year-old was dressed in an elegant emerald, green coat for the occasion, which she teamed with a matching hat. The Queen also wore pearl earrings, a matching necklace and white gloves.
Her Majesty rounded off the look with a diamond bow brooch, which is also meaningful. It carries a long family history and is one of a trio in different sizes with the same design that the Queen has worn on poignant royal occasions.
However, it was her mourning pin that took centre stage. During most of her 70-year reign, the Queen was supported by Prince Philip, who died aged 99 on 9 April 2021. Mourning pins tend to be worn by members of the royal family following a death.
The mourning pin was worn on the Queen's hat
The day before, Prince Charles remembered Prince Philip in an emotional speech given at the Party at the Palace after show-stopping performances from music legends like Sir Elton John, Rod Stewart and Alicia Keys.
In a touching moment, Charles spoke of his "much missed" late father, calling him, "My Papa" and saying the Queen's late husband Philip was there "in spirit".
He said: "Your 'strength and stay' is much missed this evening but I am sure he is here in spirit... "My Papa would have enjoyed the show and joined us wholeheartedly in celebrating all you continue to do for your country and your people."
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