[1] George IV wore the diadem over his velvet cap of maintenance in the procession to his coronation at Westminster Abbey.

[3] The gold and silver frame, measuring 7.5 centimetres (3.0 in) tall and 19 centimetres (7.5 in) in diameter, is decorated with 1,333 diamonds weighing a total of 320 carats (64 g), including a four-carat yellow diamond in the front cross pattée.

[5] Instead of the heraldic fleurs-de-lis usually seen on British crowns, the diadem has four bouquets of roses, thistles and shamrocks, the floral symbols of England, Scotland and Ireland respectively,[6] alternating with four crosses pattée around the top of its base.

The diadem may have been reset with jewels from the royal collection for Queen Victoria,[7] although the Royal Collection Trust suggests the original 1820 stones were discreetly purchased from Rundell Bridge and Rundell and remain in situ.

[10] The iconic piece of jewellery has featured in many portraits of Queen Elizabeth II, including one painted by Lucian Freud in 2001[11] and one by Raphael Maklouf in 1984 that appears on Commonwealth coinage.