Thank You Franck!

Since this article has been published, I've received a message from someone with a source in the Royal Palace in Oslo, who have told me that there are a lot of 'big' jewels from Queen Alexandra that lie unworn in the vault, because they are too old, outdated, and possibly fragile.

We know the Diamond Chandelier Pendants/Earrings from the necklace are now worn by Queen Sonja, so it is quite possible that the other elements of the necklace are with the Norwegian Royals too, though I doubt it exists in its original worm.