The Crown of Queen Elizabeth The Queen Mother, also known as the Queen Mother's Crown, is the crown made for Queen Elizabeth to wear at her coronation in 1937 and State Openings of Parliament during the reign of her husband, King George VI. The crown was made by Garrard & Co., the Crown Jeweller at the time, and is modelled partly on the design of the Crown of Queen Mary, though it differs by having four half-arches instead of the eight that Queen Mary's Crown originally had. As with Queen Mary's Crown, its arches are detachable at the crosses pattée, allowing it to be worn as a circlet or open crown. It is the only crown for a British king or queen to be made of platinum.

Elizabeth Angela Marguerite Bowes-Lyon was Queen of the United Kingdom and the Dominions of the British Commonwealth from 11 December 1936 to 6 February 1952 as the wife of King George VI. She was also the last Empress of India from 1936 until the British Raj was dissolved in August 1947. After her husband died, she was officially known as Queen Elizabeth The Queen Mother, to avoid confusion with her daughter Queen Elizabeth II.