Second crowned portrait of HM Queen Elizabeth II facing right, wearing the Girls of Great Britain and Ireland tiara.

The Girls of Great Britain and Ireland tiara was a wedding present in 1947 from her grandmother, Queen Mary, who received it as a gift from the Girls of Great Britain and Ireland in 1893 on the occasion of her marriage to the Duke of York, later George V. Made by E. Wolfe & Co., it was purchased from Garrard & Co. by a committee organised by Lady Eve Greville. In 1914, Mary adapted the tiara to take 13 diamonds in place of the large oriental pearls surmounting the tiara. At first, Elizabeth wore the tiara without its base and pearls but the base was reattached in 1969. The Girls of Great Britain and Ireland Tiara is one of Elizabeth's most recognisable pieces of jewellery due to its widespread use on British banknotes and coinage.

Elizabeth II (Elizabeth Alexandra Mary; 1926–2022) was Queen of the United Kingdom and of 14 other Commonwealth realms. Her reign of 70 years and seven months, which began on 6 February 1952, was the longest of any British monarch in history.

When her father died in February 1952, Elizabeth—then 25 years old—became queen regnant of seven independent Commonwealth countries: the United Kingdom, Canada, Australia, New Zealand, South Africa, Pakistan, and Ceylon (Sri Lanka), as well as Head of the Commonwealth. Elizabeth reigned as a constitutional monarch through major political changes such as the Troubles in Northern Ireland, devolution in the United Kingdom, the decolonisation of Africa, and the United Kingdom's accession to the European Communities and withdrawal from the European Union. The number of her realms varied over time as territories have gained independence and some realms have become republics.

Times of personal significance have included the births and marriages of her children, grandchildren, and great grandchildren, her coronation in 1953 and the celebrations of her Silver, Golden, Diamond, and Platinum jubilees in 1977, 2002, 2012, and 2022, respectively.

ELIZABETH II DEI GRATIA REGINA means Elizabeth II, by the grace of God, Queen.

Engraver: Arnold Machin

A voyageur and an aboriginal travelling by canoe, carrying bundles of which one bears the initials "HB" for Hudson's Bay Company, are surrounded with the facial value and the inscription "CANADA".

Engraver: Emanuel Hahn