The Sydney Morning Herald even reported before the Queen Mother landed in the country that she would receive “a diamond and ruby brooch unofficially estimated to cost more than £5,000”.

The Queen’s mother wore the brooch for the first time in Brisbane, on February 16, 1958, pinned to a draping white organza dress.

Since her mother’s death, Her Majesty has worn the brooch to various engagements.

The first time she donned the inherited brooch was in 2006, for her grandson William’s passing out parade at the Royal Military Academy in Sandhurst.