Camilla certainly does seem to have a bottomless jewel box--I love her new pearl necklace with what appears to be an enamed and diamond clasp. However, it is her right as a member of the BRF to wear anything that she wants. If the Princes' wished her not to do so, I'm sure she would not. She doesn't wear it often, though. I vastly prefer that other delightful Wales brooch, anyway. Truly breathtaking--I've not seen it on the QM so I am curious about it origin. Camilla's engagement ring is truly beautiful- and while it is valuable monetarily, I do think its value sentimentally is priceless. I think it was a gift to QEQM (when Duchess of York) upon the birth of Princess Elizabeth (Future QEII). However, let's not forget that Diana's ring was not mere trinket (cost of over 28,500 pounds) and it followed a long standing British Royal Family tradition of giving sapphires as engagment rings (QEQM, Princess Marina, Princess Anne, Princess Michael, Duchess of Kent). And, it is a stunning piece of jewelry.