Rings in Kingdom Come Deliverance are covered on this page.
gold ring drops from deutsch in skalitz
a golden ring can be stolen from german guy in first version of skaditz
There's a Ring called "Drahomira's Ring" that you can get from the Restless Spirits quest.
Bianca's ring should be included in this list. A unique ring received from Bianca towards the beginning of the game. (avoiding spoilers)