Here are some more pictures to add to the discussion.
The first 2 are a comparison. I think that it looks as if the Duchess of Cornwall is wearing QEQM's diamond crescent (and sapphire) bracelet on her left wrist.
The DofC's right wrist is NOT the other bracelet.
Photos 2 and 3 do show the same bracelet (the top one worn by QEQM.) It looks to be all diamonds - for lack of a better term in a sort of alternating "buckle and button" combination.
The 3rd picture adds chaos to confusion by introducing yet another diamond bracelet !