Scarlet Ruby

Source

 * Prospected from and
 * Also can be mined from Cobalt Deposit, Rich Cobalt Deposit, Saronite Deposit, Rich Saronite Deposit, and Titanium Vein.

Vendors
In Patch 3.2, this gem is no longer available for purchase from any vendor, and has been replaced by its epic version, Cardinal Ruby.

Enchanting

 * Enchant Weapon - Blood Draining