Third crowned portrait of HM Queen Elizabeth II facing right, wearing the George IV State Diadem.

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.

Engraver: Raphael David Maklouf

Stanley (front with a rifle) and Livingstone (on the background), all inside decorated ring interrupted by the legend.

Sir Henry Morton Stanley (1841–1904) was a Welsh-American journalist and explorer who was famous for his exploration of central Africa and his search for missionary and explorer David Livingstone. Stanley is also known for his search for the source of the Nile, his work in and development of the Congo Basin region in association with King Leopold II of Belgium, and commanding the Emin Pasha Relief Expedition.

David Livingstone (1813–1873) was a Scottish Christian Congregationalist, pioneer medical missionary with the London Missionary Society, an explorer in Africa, and one of the most popular British heroes of the late-19th-century in the Victorian era. He had a mythical status that operated on a number of interconnected levels: Protestant missionary martyr, working-class "rags-to-riches" inspirational story, scientific investigator and explorer, imperial reformer, anti-slavery crusader, and advocate of commercial and colonial expansion.

Livingstone completely lost contact with the outside world for six years and was ill for most of the last four years of his life. Henry Morton Stanley had been sent to find him by the New York Herald newspaper in 1869. He found Livingstone in the town of Ujiji on the shores of Lake Tanganyika on 10 November 1871, greeting him with the now famous words "Dr. Livingstone, I presume?" Livingstone responded, "Yes", and then "I feel thankful that I am here to welcome you." The words are famous because of their perceived humor, Livingstone being the only other white person for hundreds of miles. Despite Stanley's urgings, Livingstone was determined not to leave Africa until his mission was complete.