• Emerald Signet Ring
• Item Level 219Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
• Unique-Equipped
• Finger
• +38 Stamina
  +48 Intellect
  +43 Spirit
• Requires Level 80
• Equip: Improves hit rating by 34.
  Equip: Increases spell power by 70.
• Sell Price: 7 56 23

Source

This item can be found inside the Cache of Living Stone after defeating Kologarn in the 10-man version of Ulduar.

Patch changes

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

External links

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