The Heartstone Necklace is a unique Gold Necklace worn by General Falx Carius and Ildari Sarothril. The in-game for this item is "Gold Necklace," but the Editor ID is DLC2HeartstoneNecklace. While having the same inventory appearance as a standard Gold Necklace, when equipped it will actually add a Heart Stone to the character model, which will be covered up by the armor, unless one wears General Carius' Armor (as male) or Telvanni Robes (as female), which have a deliberate hole in their model for the stone.