Wrath of the Lich King Classic is now live, and with it comes a brand new set of gems created by the Jewelcrafting profession, which was introduced in Burning Crusade Classic. Gems and Jewelcrafting work much as they did in BCC, but you'll find a whole new selection of cuts to socket in your gear.
Gems were a new addition to WoW in the original Burning Crusade, and The Burning Crusade Classic players can learn Jewelcrafting to cut gems for their gear.
One of the main selling points of World of Warcraft's forthcoming expansion Dragonflight is a serious revamp of the profession system.
One of the things that's been a big part of gearing in Battle for Azeroth is randomness.
Okay, so if you're really focused on the various professions in World of Warcraft, then the last couple of expansions may have felt somewhat disappointing to you.
My main is a jewelcrafter and an engineer, and neither of these professions were learned for anything other than giving myself a boost. I've had engineering since I created the character back in Burning Crusade, but I've flipped my secondary profession around a few different times to something I felt would be useful -- in Wrath I had leatherworking for a short period of time. I seem to have settled on jewelcrafting as a semi-permanent one for now though, mostly because I always need gems for something.