Curufin (dwarvish blade)

Curufin was an enchanted blade of dwarvish origin creatd by the wicked dwarves of Nogrod in the Lays of Beleriand

Background
The treacherous smiths of Nogrod also made Curufin; a cunning blade of dwarvish steel with hard edge, and bitter cold. Many Nogrod songs were told of it. How dwarvish armourers long ago sung slow enchantments over it, where their hammers fell (hammer songs) like the sound of a bell. It clove iron like tender wood and through mail like wool. It was wielded by Flinding (Gwindor/ Beren)  to cut a silmaril from Morgoth's crown. Even Morgoth's gleaming coat of armor was made of rings of steel no arrow could pierce, made of web of dwarvish craft. He was able to break a silmaril free from iron claws that held it, but the knife snapped betraying him to Morgoth when he went for a second gem.

Behind the scenes
The name Curufin was recycled in the name of a prince of the Noldor.