Fourth 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.

Engraver: Ian Rank-Broadley

The reverse design features the Norfolk Island Coat of Arms, representing one of 9 states and territories that make up Australia and features a Norfolk Pine growing on a rocky mound with a book (almost certainly the Bible) inside the shield with two 5-pointed stars representing the Coats of Arms of Australia, New South Wales and that of Captain James Cook who discovered Norfolk Island in 1774. Supporting the shield are Britain's Lion and Australia's Kangaroo holding Naval anchors. The Lion above a Naval Crown holds a covered cup. In the banner "Inasmuch" is taken from the Gospel of Matthew in the New Testament. Flanking the Coat of Arms are the dates 1901 and 2001. Around above, CENTENARY OF FEDERATION. Below the Coat of Arms, NORFOLK ISLAND. Around below, the denomination FIFTY CENTS.

Norfolk Island is a small island in the Pacific Ocean located between Australia, New Zealand, and New Caledonia. The island is part of the Commonwealth of Australia. Together with two neighbouring islands, it forms one of Australia's external territories. Its capital is Kingston.

Norfolk Island was first settled by East Polynesians but was long unpopulated. The first European known to have sighted and landed on the island was Captain James Cook, on 10 October 1774, on his second voyage to the South Pacific on HMS Resolution. He named it after Mary Howard, Duchess of Norfolk (c. 1712–1773). The decision to settle Norfolk Island was taken due to Empress Catherine II of Russia's decision to restrict sales of hemp. Practically all the hemp and flax required by the Royal Navy for cordage and sailcloth was imported from Russia. In 1914 the UK handed Norfolk Island over to Australia to administer as an external territory.