Prospecting (WoW)  

Prospecting is a Jewelcrafter ability that allows them to turn a stack of five raw ore into precious gems. Only common ores (not green-quality or quest ores) can be prospected. Note that, unlike disenchanting, you cannot gain skill from prospecting.

Common Yields of Prospecting

Prospecting ore will always result in some type of powder and a green-quality, sometimes 2, gem. There is also a chance to obtain an additional green-quality gem, or a blue-quality gem from ore in Outland. The type of gem obtained always includes what can be mined from a node of that ore, with the exception that prospecting Thorium Ore will not result in an Arcane Crystal.