Lady Louise Windsor paid a subtle tribute to the Queen as the monarch's grandchildren held a coffin vigil on Saturday.
The daughter of the Count and Countess of Wessex, 18, stood alongside her royal cousins in Westminster Hall.
She wore an all-black ensemble of a coat dress, tights, heels and a black head piece.
Proudly on display was a silver necklace, featuring a horse pendant, that appeared to directly honour the late monarch.
Indeed, the Queen's youngest granddaughter enjoyed a shared love of all things equestrian with her, and the pair were pictured in the past riding together.
It comes as it was revealed Her Majesty was discussing "her love for her horses right to the very end", according to her bloodstock and racing adviser.
Speaking to the PA news agency, John Warren – who was with her at Balmoral the weekend before she died – said: "We sat there for hours over the weekend strategising and making plans going forward."
At 6pm on Saturday, Louise filed towards the coffin beside her 14-year-old brother James, Viscount Severn – with whom she was also stood alongside at the coffin procession a few days earlier.
They joined Her Majesty's other six grandchildren – Prince William, Prince Harry, Princess Beatrice, Princess Eugenie, Peter Phillips and Zara Phillips.
King Charles' two sons stood guard at the head and foot of the coffin, and the group remained there with their heads bowed for 15 minutes.
Viewing the vigil from above were Louise and James's parents, Prince Edward and Sophie Wessex.
The family are based at Bagshot Park, which is 11 miles away from the Queen's Berkshire home of Windsor Castle.
Watch: Queen's granddaughters shed tears as senior royals inspect flowers left at Balmoral