A certain blacksmith friend of mine recently pointed out that she had a hard time remembering which types of mineral deposits she needed to hit when looking for particular gems for her smithing plans. It struck me that a gadget to provide such info would be quite similar in design to my existing Disenchant Predictor, and a few minutes later, I had this little doodad. I call it Gemologist -- it instantly analyzes any gem (or reference to one) you see and tells you where it can be found in nature.

Features
Simple enough for even an ogre to use: Whenever you see a gem (in your tradeskill window, on the Auction House, or wherever), the tooltip will provide a list of what types of common minerals a miner can find that type of gem with.