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LONDON, ENGLAND - JUNE 28: The Girls of Great Britain and Ireland tiara on display in the Diamonds: A Jubilee Celebration exhibition which forms part of the summer opening of Buckingham Palace on June 28, 2012 in London, England. 10,000 diamonds set in works acquired by six monarchs over three centuries go on display to mark Queen Elizabeth II's 60 year reign. With many items from the Queen's personal collection joining those chosen for their artistic significance and historical importance from the Royal Collection. The exhibition opens on Saturday and runs til 8th July and then again from July 31 to October 7. (Photo by Bethany Clarke/Getty Images)

LONDON, ENGLAND - JUNE 28: The Girls of Great Britain and Ireland tiara on display in the Diamonds: A Jubilee Celebration exhibition which forms part of the summer opening of Buckingham Palace on June 28, 2012 in London, England. 10,000 diamonds set in works acquired by six monarchs over three centuries go on display to mark Queen Elizabeth II's 60 year reign.  With many items from the Queen's personal collection joining those chosen for their artistic significance and historical importance from the Royal Collection. The exhibition opens on Saturday and runs til 8th July and then again from July 31 to October 7. (Photo by Bethany Clarke/Getty Images)

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The Girls of Great Britain and Ireland Tiara, E Wolff & Co for R&S Garrard & Co, 1893, a part of Queen Elizabeth II's personal collection including magnificent jewels and photographs of the Queen, which will go on show in the special display Platinum Jubilee: The Queen's Accession at the Summer Opening of Buckingham Palace from 22 July. Picture date: Thursday July 21, 2022. (Photo by Kirsty O'Connor/PA Images via Getty Images)

The Girls of Great Britain and Ireland Tiara, E Wolff & Co for R&S Garrard & Co, 1893, a part of Queen Elizabeth II's personal collection including magnificent jewels and photographs of the Queen, which will go on show in the special display Platinum Jubilee: The Queen's Accession at the Summer Opening of Buckingham Palace from 22 July. Picture date: Thursday July 21, 2022. (Photo by Kirsty O'Connor/PA Images via Getty Images)