• Vindicator's Silk Belt
• Item Level 146Disenchants into:
  [Void Crystal]: 1-2
• Binds when picked up
  
• Cloth
• Waist
• 208 Armor
• +30 Intellect
  +43 Stamina
• Durability 35 / 35
• Classes: Priest, Mage, Warlock
• Requires Level 70
• Equip: Improves resilience rating by 26.
  Equip: Improves critical strike rating by 28.
  Equip: Increases spell power by 35.
• 

Introduced with Arena Season 3 to replace [Veteran's Silk Belt], [General's Silk Belt] and [Marshal's Silk Belt] all of which are no longer available for purchase.

Source

The cost is 17,850 40 and is available from these PvP vendors:

•  Lieutenant Tristia <Armor Quartermaster> Champions' Hall, Stormwind
•  Doris Volanthius <Armor Quartermaster> Hall of Legends, Orgrimmar

Patches

Patch 2.3.0 (13-Nov-2007): Added. 
Patch 2.4.0 (25-Mar-2008): Lost 2 spell critical strike rating and gained 70 armor. 
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External links

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