Here is the Duchess of Cornwall attending a dinner following the Cambridge wedding in 2011. They look like the same two bracelets as in your picture of the Queen Mother wearing the bunch of grapes brooch in 1954. I`d say one definitely is, the other is a bit harder to tell. The one with the crescent or horseshoe shapes, looks the same. It is the unusual brooch the Queen Mother owned that had sapphires on the other side. : : : : : : : :