The Queen's name has been inscribed alongside her mother's, father's and husband's on the ledger stone in the Windsor chapel where she is buried.
The late monarch was laid to rest together with the Duke of Edinburgh on Monday evening in a private service attended by the King and other members of the Royal Family, which followed her state funeral at Westminster Abbey and committal service in Windsor.
Buckingham Palace said the inscription on the ledger stone in the George VI Memorial Chapel now had the names of the Queen, her parents and Philip, along with their years of birth and death.
The stone, which is new, has replaced the black stone slab set into the floor, which had featured the names George VI and Elizabeth in gold lettering.
The fresh stone now says, in list form, "George VI 1895-1952" and "Elizabeth 1900-2002" followed by a metal Garter Star, and then "Elizabeth II 1926-2022" and "Philip 1921-2021". No image has been released of the new stone.
All four royals were members of the Order of the Garter, which has St George's Chapel as its spiritual home.
When Philip died 17 months ago, his coffin was interred in the royal vault of St George's, ready to be moved to the memorial chapel - a pale stone annexe added on to the north side of the building behind the North Quire Aisle in 1969 - when the Queen died.
The Queen's sister Princess Margaret, who died in 2002, was cremated, and her ashes were initially placed in the royal vault, before being moved to the George VI memorial chapel with her parents' coffins when the Queen Mother died weeks later.
King Charles flew to Scotland on Tuesday with the Queen Consort to grieve privately, as the Royal Family continues its period of mourning for the Queen.
He left Aberdeen airport after flying in from RAF Northolt in west London, reportedly bound for Balmoral - the estate on which the King's Scottish home of Birkhall is located.
He decreed on 9 September, the day after the Queen died following her 70-year reign, a period of mourning would be observed until seven days after the funeral.
Members of the Royal Family are not expected to carry out official engagements, and flags at royal residences will remain at half-mast until 8am after the final day of royal mourning.
No date has been fixed for King Charles's coronation, but it is expected that, in line with royal precedent and due to the large amount of planning involved, there will be at least several months until it takes place.
It is estimated around a quarter of a million people paid their respects to the Queen in person by viewing her coffin as it lay in state in London.
Culture Secretary Michelle Donelan said on Tuesday her department was still "crunching the numbers" as to how many people had queued for hours to process past the coffin at Westminster Hall, but that she believed it was around 250,000.
St John Ambulance said that, together with London Ambulance Service - both of which helped during the national period of mourning, including caring for those in long queues to see the coffin - it had treated more than 2,000 people and taken around 200 of them to hospital, mainly due to existing health conditions, trips, slips and falls.