My instinctive reaction when I initially saw the photo was that the brooch was the Richmond brooch given to Queen Mary for her wedding, and that the bracelet was the black and white pearl one now worn by QEII. Yet, I hesitated over the bracelet, and I still think that we need a clearer photo of the bracelet to be sure.

J-F you have the most amazing archive and recognition of jewels worn by the different ladies over time! I hadn't previously noticed the brooch now worn by Princess Michael of Kent. Thank you!