Are you referring to this necklace worn by Princess Astrid GalP?
I recollect that there was a discussion on the Royal Jewels of the World Message Board (in 2017 I think) and I think that the consensus was that it was not the same -- but I cannot recollect with certainty.
I know that the discussion took place not long after I found the photos of the gift which the City of Paris gave to Queen Maud. Before that no seemed to know that the jewel existed.

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I have to ask, but when they had the 18th year gala of Crown Prince Haakon Magnus in 1991, Princess Astrid wore parts of that sautoir as a necklace and parts of it as a bracelet. That's what it looks like, the design, and I asked the late court reporter Mr. Totland about the same issue. He was not sure, but said my theory was interesting...