• Diamond Runestone
• Item Level 1Disenchants into:
  Not disenchantable
• Binds when picked up
• Unique

Source

Taken from the Pillar of Diamond.

Objective of

Must be used to break the seal on Seal of the Earth for the quests:

•  [50] Broken Alliances
•  [50] Tremors of the Earth

External links

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