The Queen made a touching gesture to Prince Philip by wearing a silver brooch from their engagement in her latest video call.
Prince Philip, 99, is spending his tenth night in hospital with an infection but royal duties are carrying on as normal at Windsor Castle.
During a video call with health leaders delivering the Covid-19 vaccine, the Queen called on the public to step up for their jab and issued a stern rebuke to anti-vaxxers.
In a subtle tribute to the Duke of Edinburgh, the monarch was seen wearing a brooch she first wore for their engagement 74 years ago.
The diamond clematis was first worn by Her Majesty in her official engagement photos with Prince Philip in July 1947.
Black and white images from the special occasion show the then-Princess Elizabeth wearing the six-petal brooch next to her future husband.
It's believed the brooch, which features six petals encrusted with diamonds and a single diamond in the centre of the piece, was a 21st birthday present from the Royal Household.
The Queen is no stranger to re-wearing sentimental jewellery and she was seen wearing a chrysanthemum brooch made from sapphires and diamonds from her honeymoon in official photos for the couple's 73rd wedding anniversary last year.
In photos for Prince Philip's 99th birthday she wore the heart-shaped Cullinan V diamond brooch.
Her decision to wear her engagement brooch comes as Prince Philip remains in hospital receiving treatment for a non-Covid infection.
The couple have been isolating together at Windsor Castle and the Duke's hospital stay is the longest they have spent apart in nearly a year.
Philip was admitted to King Edward VII's Hospital in London on February 16 as a precautionary measure after feeling unwell, and walked into the building unaided.
At the time Philip was admitted to hospital, Buckingham Palace did not disclose the reason, but have now revealed he is being treated for an infection and is "comfortable".
There will be concern for the duke because of his age, but members of the monarchy have continued with royal duties this week.
In her latest royal engagement the head of state shared her thoughts on the importance of the coronavirus vaccine.
Her Majesty last month chose to go public with the news she had received the vaccine alongside husband Prince Philip, 99, to send a “message of hope” to the country.
She said after having the vaccine you felt "protected", while she compared the awful disease to the "plague" during a video call with health leaders delivering the Covid-19 vaccine across the four nations.