I believe that this is the brooch that belonged to Paul I, which she loaned to her son, Michael, to wear at a costume ball and which he did in his hat. It was lost at the ball and never recovered.
--Previous Message-- : : Brooch 8 : Formal court dress image 1890. A different : diamond brooch seems to be worn here. I : can't find a clearer image of this piece. : : : : It appears she also wore this same brooch to : her son's coronation in 1896 : : : : Though this painting shows the brooch as a : crescent with a circle on top which seems to : match the photo. : : : : : : : : :