Currency and Rings
Most of the monetary wealth in the Thanelands is in the form of rings. These aren't finger-sized rings, they are generally 2" – 4" diameter pieces of solid gold jewelry suitable for weaving into hair or beard or attaching to clothing. For simplicity of accounting, all rings are taken to be worth 10 gp. It is usual for an Ulfen warrior in formal attire to have plenty of rings in his outfit.
King Sveinn has been trying to introduce minted coinage in Kalsgard, but in the outlying lands those are viewed with suspicion – if a Skeggvason comes into a hoard of gold coins, his inclination would be to melt it down and make rings.
The dvergar make the best rings. (But they're still just worth 10 gp.)