The Queen, accompanied by the Duke of York, hosted a Garden Party at Buckingham Palace for the Not Forgotten Association.
We haven't seen this brooch in action since 2011, by my count - far too long for such a luscious group of diamonds to be neglected! Thank goodness Her Maj is in a mood to delight this year.
Updated to add: Also today, the Queen held audiences (click here), wearing the Greville Scroll Brooch. One of the people she received was the new High Commissioner for the Commonwealth of Australia, so maybe that inspired her wattle choice for the garden party.