Ring

A piece of equipment worn on the finger. The game supports the wearing of two rings.

With the exception of Armor Bonus (Armored Bracers), Rings are not unique. Rings duplicate the prefix and suffix of another slot. So, you can find a Charismatic Ring of Elvenkind (as available on a cloak), or a Charismatic Ring of Steady Spellcasting (as on a helm), but not a Charismatic Ring of Springing. Springing only comes on boots, and therefore can only be paired with a prefix that is also available on boots.