Not very comfortable. It can only go at walking pace.
The 91-year-old monarch noted the Imperial State Crown, which she wore during her coronation ceremony on June 2, 1953, is so heavy "your neck would break off".
"Yes. Fortunately, my father and I have about the same sort of shaped head, but once you put it on, it stays".
"It is sort of a pageant of chivalry and old-fashioned way of doing things really. I've seen one coronation (her father's in 1937) and been the recipient in the other, which is pretty remarkable".
Another eye-opening tidbit is finding out that how much the Queen hated her ride in the four-tonne carriage taking her from Buckingham Palace to Westminster Abbey.
"I remember one moment when I was going against the pile of the carpet and I couldn't move at all", she says.
The stones, including the Black Prince's Ruby from the Imperial State Crown, were placed in the metal box and buried under a sally port, a secured entrance.
"It would fall off", the queen said in excerpts released ahead of the program.
Prince Charles has previously spoke of how his mother had practised wearing the 2.2-kilogram St Edward's Crown while he was being bathed.
Elizabeth II recalls the day she was made Queen of England at the age of 25 in a BBC documentary, describing what it is like to wear the crown.
He added that Her Majesty had been aware that the jewels were hidden at Windsor by 1940, when the government was trying to hide stocks of water, but had no idea where they were buried - or that they were hiding in a biscuit tin.
She jokingly says she can not look down when wearing the imperial state crown, which weighs 2lbs 13oz (1.28kg), as her neck would "break".
The Queen acceded to the throne on 6 February, 1952 when her father died unexpectedly in his sleep at Sandringham in Norfolk. "They don't look very happy now".
Pearls are "like living things, they need warming".
Speaking to the Queen for the BBC documentary, Bruce told Her Majesty - who had been only 14 at the time - the story.
"What was so lovely was that the Queen had no knowledge of it,"Bruce told The Times".
"It's hard to always remember that diamonds are stones... so, very heavy", interviewer Alastair Bruce said.
American evangelist Billy Graham is introduced in the second season of the series as the queen is shown wrestling with her faith and the concept of forgiveness due to feelings of betrayal by a family member.
Bruce said: "If you look very closely, the table suddenly just goes "woomf" and the crown "woomf" and the crown jeweller is left there with nothing and she says 'well you know, it's my crown'".