The diamond clips worn by the Queen Mother were presented by her to Sophie Rhys-Jones on her wedding to the Earl of Wessex in 1999, and have been worn by the Countess regularly since then:
18 June 2014, Royal Ascot:
(Pictures: Chris Jackson/Getty Images Europe)
14 May 2004: Crown Prince Frederik of Denmark and Mary Donaldson's wedding in Copenhagen: (Pictures: Sean Gallup/Getty Images Entertainment)
Their design is clearly différent from the brooch worn today by the Queen:
I do not think either that the brooch worn today by Queen Elizabeth II could be this unidentified brooch worn by Queen Mary (about which we had had a discussion a few months ago):