Iron Crown
From Tolkien Gateway
The crown forged by Morgoth after his return to Middle-earth to hold the three Silmarils; he bore it throughout the First Age, but after his defeat by the Valar the crown was beaten into a collar for his neck.
The crown forged by Morgoth after his return to Middle-earth to hold the three Silmarils; he bore it throughout the First Age, but after his defeat by the Valar the crown was beaten into a collar for his neck.