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Congratulations on your article - a lovely tribute.
I have never been 100% sure of where all Princess Marina's collet necklaces originated, nor have I previously thought about the fate of the diamonds forming the swags under the bow brooch.
I suspect that the diamonds would have been too small to have formed the central part of the collect necklaces, but definitely may have been used for the sections at the back of the necklaces, especially to lengthen one of them.