Maelstrom Sapphire

Source
This item can be found when Prospecting Felslate and Leystone Ore.

Jewelcrafting

 * Ancient Maelstrom Amulet
 * JewelCraft
 * Maelstrom Band
 * Sylvan Maelstrom Amulet
 * Versatile Maelstrom Sapphire

Leatherworking

 * Gravenscale Warhelm