Quest Giver: Corrick Northwode
Reward: Level adjusted gems
If you started this quest by finding the amulet, then you simply have to go to Harm's Folly and speak with Corrick. He will remark on the seemingly divine intervention, and immediately give you your reward, thus ending the quest.
If you started by speaking with Corrick, he points you towards Exhausted Mine, which lies a very short distance to the Southwest. It has three levels, and a number of goblins, but should be no real difficulty. The boss will be a goblin Skirmisher, Berserker, or a Shaman. Kill him, retrieve the amulet from his corpse, and return to Corrick for your reward, which will always consist of level-dependent gems.
After finishing this quest, paying your respects at Kayleen Northwode's headstone will result in her spirit blessing you from the afterlife, fortifying your health and fatigue by 30 points for 600 seconds.
This quest has a serious bug in any un-patched game, preventing the player from finishing the quest. If the player has completed the quest No Stone Unturned and collected the research notes for Lithnilian, Corrick will not be able to recognize that the player has brought him the amulet, leaving the player with an unfinished quest and a stuck quest item. Luckily, the amulet has 0 weight, and thereby doesn't really hinder the player at all. This bug has been fixed in the Knights of the Nine expansion for the Xbox 360 version and by Patch for the PC version.