Definition

Blizzard Entertainment introduced Jewelcrafting in The Burning Crusade expansion (2007), and it became an instant favorite for its ability to provide both personal benefits and valuable trade opportunities in the player-driven economy. The WoW community soon gave the profession the "jc" abbreviation to save time during the in-game chat, where players often post requests like "LF JC" (Looking for Jewelcrafter) when seeking someone to cut gems or craft specific items.

Origin

slang.net