Thanks to Plattym3 for this information

Name	Buy	Sell	Found	Description
Adornment Ring		1,000		Sell for a high price
Antidote Ring		200		Keeps your strength from getting lowered
Awaken Ring		100		Keeps you from falling asleep
Belly Ring		200		Keeps you from getting hungry
Disarm Ring		500		Keeps traps from working
Puppet Ring		250		Keeps Mud Dolls from stealing your EXP
Starve Ring		200		Makes you get hungry twice as fast
Strength Ring		200		Raises strength by 3