Lionseye

Source

 * Mined from Ancient Gem Veins in Hyjal Summit
 * Drops from trash mobs in the Black Temple and Sunwell Plateau
 * Can occasionally be found inside of Brilliant Glass created by Jewelcrafters

Yellow Gems

 * Mystic Lionseye
 * Quick Lionseye
 * Smooth Lionseye
 * Subtle Lionseye