Qiraji Ceremonial Ring

Qiraji Ceremonial Ring is a Cenarion Circle armor token. It can be exchanged along with various idols and scarabs at various NPCs at Cenarion Hold for the following items:
 * Signet of the Unseen Path
 * Band of Veiled Shadows
 * Ring of Infinite Wisdom
 * Ring of Unspoken Names

Source
This item drops from all bosses in the Ruins of Ahn'Qiraj.