Wow, did Orgrimmar study jewelry processing? Thank you for your questions.
There is no NPC to learn in the major cities of jewelry processing! 1-300: Tribe, Emin-Yinyue City, Union with coordinates (90 75), Padar-Esoda with coordinates (44 24) 300-375: Tribe, Salma Hotel on Hellfire Peninsula. Hellfire Peninsula Alliance-Glory Castle Hotel. Prepare low-grade emeralds or low-grade minerals in the early stage.