Dear Beth,
Congratulations to these photos !!
I was awaiting for new photos for many years !! thank you so much !!
Please find below screenshots of this unknown necklace :
I think it is a long sautoir with small turquoises (maybe with pearls) with triangle motifs ?
Franck

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That's definitely much lower! I wonder why she would have felt the need to lenghten a necklace which she wore without extension with the same gown a couple of weeks later? Doesn't make sense really, and seems to support the theory that it's a different necklace altogether.