• Radiant Seal
• Item Level 226Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
• Unique-Equipped
• Finger
• +41 Stamina
  +42 Intellect
• Requires Level 80
• Equip: Improves haste rating by 46.
  Equip: Increases spell power by 74.
  Equip: Increases your mana regen by 14.
• Sell Price: 7 56 23

Source

This item drops from Assembly of Iron in the 25-man version of Ulduar.

Patch changes

• Patch 3.1.0 (14-Apr-2009): Added. 
  

External links

• Battle.net (EU)
• Wowhead
• Thottbot
• WoWDB