In 1944, Princess Elizabeth launched the ship HMS Vanguard and was presented with this antique diamond brooch by Messrs. John Brown, the shipbuilder. It is in the shape of a wild rose with leaves, the stem tied with a small bow.
This was an early addition to the Queen’s jewel collection, coming before her wedding, her accession and coronation, and her many tours. It was worn often in those early years, but as the Queen’s brooch options expanded it was used less and less. Today it would be a rare spotting.