Ruby Ring

Ruby Rings are highly valuable loot found rarely in Baldur's Gate. Several can be found in the sewers beneath Baldur's Gate City and can be given to the farmer Brun in addition to gold to help save his farm.

In-Game Description
"A ring is a small band of precious metal that is used as jewelry. Some rings have enchantments placed upon them, and confer various magical abilities. Such rings are rare and highly sought after, especially by those of the adventuring profession."