The Nobelesse et Royautes blog has an interesting entry about King Michael being honoured for receiving the Royal Victoria Order 75 years ago. The event obviously was a proper white tie event. CP Margarita wore her greek key tiara once again. On the second photo you can also see Princess Elena wearing a tiara. But unfortunately the pic is too small to make it out properly.
Is it the same tiara she wore at her wedding? Is there anythings known about the history of this tiara?