The Necklace of the Dwarves, a fabulous piece of jewellery created by the Dwarves of Ered Luin in the First Age. King Thingol of Doriath has the necklace refashioned to hold the Silmaril recovered by Beren and Luthien. The resulting dispute between Thingol and the Dwarven craftsmen leads to Thingol's murder and the sack of Doriath, making the Nauglamir a catalyst for some of the great tragedies of the Elder Days.