The Earrings and Brooch are made by Håkan Orrling - Orrling Jewels,
On his instagram story it says that the are made by white gold, diamonds and blue topazes (It does say London blue, is that a thing?).

here is an article. google translation below.

https://www.femina.se/mode/prinsessan-sofias-klanning-och-smycken-pa-nobelfesten-2024/10571024

Princess Sofia has specially designed jewelery with diamonds, white gold and London blue topazes from the Swedish jewelery designer Håkan Orrling.

The princess wore jewelry from Orrling this summer when the Norwegian princess Märtha Louise and the American shaman Durek Verrett got married - a new favorite she will return to at the Nobel party!

Håkan Orrling tells Femina more about the manufacturing process and the details. For several weeks, they have worked intensively to produce the sparkling diamond jewelry.
- She (Princess Sofia, ed.) had some opinions, especially about the earrings, so they would fit. I made them pretty crazy initially, if you can put it that way. We toned down the design a bit in the more classic direction, he says.

The earrings have London blue topazes – something that matches her blue dress which is more of a cobalt shade.

How do they feel to design this jewelry for the princess?

- Of course, it feels a little extra fun when it gets noticed. It's fun that our small business gets to participate, he says.