Edit: I am getting a lot more info and will expand and clarify. Confused between diamond or pearl bracelets.
Because the badges are oval shaped, I suggest the bracelets might be these below. One has four rows of pearls and the other has five - which seems to match the bracelets worn at coronations. I think Field mixed together some details of the William IV buckles which are square, see below.
Here is one pearl bracelet, photographed 1920 for Queen Mary.