The Queen sat at her desk in Windsor Castle's White Drawing Room as she addressed the nation on coronavirus Covid-19. She wore a green dress with a pearl necklace as she praised the NHS, thanked key workers and expressed her sympathy at people suffering during this difficult time.
She teamed the dress with a stunning diamond and turquoise brooch, which used to belong to Queen Mary. It features a large turquoise stone surrounded by diamonds.
The Queen's grandmother Queen Mary was given the piece on her wedding day, and left it to the now-monarch when she died in 1953.
She first wore it publicly in 2014 and has worn it a number of times since. She last wore the piece in August to attend a craft sale at a church near Balmoral Castle.