The whereabouts of the precious stone were not even divulged to the Queen.
The Queen, 91, told the broadcaster her diamond-encrusted Imperial State Crown, which weighs 1.3 kilograms, was "very unwieldy".
Rich with history and responsibility, the Imperial State Crown can be a heavy burden to bear. "So there are some disadvantages to crowns, but otherwise they're quite important things".
She explained she chose to play dress up and mimic the daily routine of the queen to celebrate the second season of the Netflix hit, The Crown, which premiered last month.
The Queen may enjoy the great privilege of wearing a crown, but the extravagant headpiece doesn't come without its downside. That much was clear after he was with the Queen when she watched her coronation for the very first time, as part of the upcoming documentary The Coronation, which examines the 1953 ceremony on its 65th anniversary.
"Fortunately, my father and I have about the same sort of shaped head", the Queen said, drily. "I mean, it just remains itself".
After succeeding the throne after the death of her father George VI, the Queen explains how she had the crown adjusted to make it more feminine and smaller. "Because if you did, your neck would break and it (the crown) would fall off", she said smiling.
Queen Elizabeth on the day of her coronation (gracefully avoiding any appearance of neck strain).
Queen Elizabeth II and Prince Philip after the coronation, June 1953.
It also features the Black Prince's Ruby, believed to have been worn by King Henry V in his helmet at the Battle of Agincourt in 1415. "I remember one moment when I was going against the pile of the carpet and I couldn't move at all!".
According to UK's The Telegraph, the footage is shown as part of an hour-long BBC One documentary "The Coronation" which airs in the United Kingdom this weekend and features behind-the-scenes footage of the Queen, capturing her sense of humor and life in the palace.
The story of how the service, which lasted nearly three hours, was briefly brought to a standstill has emerged in The Coronation, to be broadcast on BBC One on Sunday.
Alastair Bruce is one of the presenters of the documentary, which will be screened on Sunday.