The fifth crowned portrait of HM Queen Elizabeth II facing right, wearing the George IV State Diadem and drop earrings.

The George IV State Diadem, officially the Diamond Diadem, is a type of crown that was made in 1820 for King George IV. The diadem is worn by queens and queens consort in procession to coronations and State Openings of Parliament. The piece of jewellery has been featured in paintings and on stamps and currency. It can be seen in the Queen's Gallery at Buckingham Palace.

ELIZABETH II DEI GRATIA REGINA FIDEI DEFENSATRIX means Elizabeth II, by the grace of God, Queen and Defender of the Faith.

Engraver: Jody Clark

The letter X represents X marks the spot.

Steeped in mystery and unclear in origin, ‘X marks the spot’ has taken on many meanings and been intertwined with popular culture, mythology and everyday life for centuries. The first recorded use of X marks the spot was in 1813, although it’s widely thought that it is much older than this.

From pirates and treasure hunters to famous explorers, the saying goes that X marks the spot where the bounty is held. It’s the point to head to on an expedition, it’s where the long-lost treasure is hidden and it’s often the final meeting point in countless films.