The whereabouts of the precious stone were not even divulged to the Queen.
Photo The version of the Imperial State Crown the queen wore to her coronation had been made for father's coronation but was later slightly altered to fit her. Credit Pool photo by Eddie Mulholland The crown was too big for her head.
But despite looking the picture of happiness to the thousands of people that lined the streets to watch, she has revealed she was actually quite uncomfortable.
In the hour-long programme The Coronation, to be aired on Sunday, the Queen speaks candidly about the moment she was crowned and jokingly says she cannot look down while wearing the Imperial State Crown, which weighs 2lbs 13oz (1.28kg), as her "neck would break".
Heavy is the head who wears the crown, indeed! She jokes that she can't look down while wearing the Imperial State Crown - which weighs 2 pounds 13oz (1.28 kilograms).
"The only word I can come up with is medicinal, like cough syrup", she said. "But once you put it on, it stays. Because if you did, your neck would break and it [the crown] would fall off", she said smiling.
Photo The Duke of Edinburgh smiles as Queen Elizabeth II carries the orb and scepter into Buckingham Palace after the Coronation. I mean it's only sprung on leather.
"But they are not very happy now - they don't look very happy now", she said. Anxious that the weight of the elaborate jewels at the centrepiece of her crown would injure her neck, she quips: "So there are some disadvantages to crowns, but otherwise they're quite important things".
During World War II, the royal family took recourse to extraordinary measures to protect the most precious diamonds at Windsor Castle, a new documentary revealed.
A newly-surfaced photo shows the now 36-year-old donning a dazzling crown way back in her teenage years, along with a flowy periwinkle gown and a thick french manicure (they were all the rage then). 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.