Imperial State Crown weighs 91 kilograms. Due to the weight of the crown, it is often worn on and off for a few hours before the State Opening of Parliament, to get the wearer used to the weight. Queen Elizabeth II has been known to eat her breakfast and read the morning papers wearing it.
The Imperial State Crown (1937) is worn by the Queen at each State Opening of Parliament. One of the youngest crowns in the collection, it holds a number of much older gems. The crown was remade in 1937 after the previous frame weakened under the weight of the gemstones.
The Stewart Sapphire, which had been owned by the Royal House of Scotland for centuries, was also given to George III. The original owner of the sapphire was reputed to have been King Alexander II of Scotland, who had it set into his crown for his coronation in 1214. Edward I of England took the sapphire along with the Stone of Scone in 1296, during his invasion of Scotland. His grandson, King Edward III, later returned the jewel to his brother-in-law David II of Scotland.
Woah....In this Cecil Beaton portrait of Queen Elizabeth II set in the throne room at Buckingham Palace, London, after her coronation in June 1953, the Queen wears the Imperial State Crown and holds the Orb and Septre