Maybe they redesigned it? We don't know anything for sure. But there are several pieces of turquoises. Astrid's main necklace, is made of the turquoise drops/tops of the diamond tiara and it has several pendants to make the necklace longer or shorter, or to have pendants. There are also a similar necklace that was one of Queen Maud's wedding gifts back in 1896, which has almost similar design as the necklace Astrid wears, but with bows between each turquoise drop.
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Many thanks for the great photo OmerH! I didn't have a copy -- only the comparison I did from a much smaller image years ago.
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Here is a full length pic of Pss Astrid where the braceletscan be seen too. It does look very similar to the sautoir but not exaactly the same.