When I zoomed in on other photos from the wedding of Patricia Mountbatten, even though the photos lack high definition, it looks as if Queen Elizabeth the Queen Mother was wearing her sapphire and diamond bracelet.
Detail
The bracelet which the Duchess of Cornwall wore is so close in design to the circles section of this bracelet that there was considerable discussion as to whether she was wearing QEQM's bracelet. If I remember correctly, it was decided that they were two different bracelets. Have I remembered correctly?
For the wedding of Patricia Mountbatten QEQM also wore the diamond floral earrings which I think came from Mrs Greville.