Crown of Queen Elizabeth the Queen Mother

The Crown of Queen Elizabeth the Queen Mother, also known as the Queen Mother's Crown, is the crown made for Queen Elizabeth the Queen Mother 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 either as a circlet or open crown.

Source: Wikipedia — Crown of Queen Elizabeth the Queen Mother (CC BY-SA 4.0)