The Imperial State Crown and the Black Prince's Ruby: The stone that is really a spinel and worn by Queen Elizabeth | August birthstone - 9Honey
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Story of a crown: sapphire, pearls, ruby and diamond all tell a tale | Queen Elizabeth II | The Guardian
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George I's state crown in a watercolor by Giuseppe Grisoni, 1718. The Black Prince's Ruby dominates the front. | Royal jewelry, Royal jewels, Crown jewels
The Imperial State Crown and the Black Prince's Ruby: The stone that is really a spinel and worn by Queen Elizabeth | August birthstone - 9Honey
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