In Dalaran jewelry processing trainer's office, one coin can be exchanged every day, 1 fried titan iron ore 10, one more broken necklace (250G/ piece) every day, one more coin, and the rest is the task of fishing.
If you only need to practice the drawings of skill points, in Dalaran auction house, please note that Dalaran auction house is dedicated to engineering, which means only engineering can see and use it. The specific NPC is in (project NPC as shown in the figure). You can practice to 450 here.
The formula of jewelry processing, except for the off-line, is basically sold by jewelry trainers Make jewelry every day and you will be given a jewelry badge. You need to exchange three jewelry badges for 1 jewelry drawings, and two for 1 purple gemstone drawings for your own use. Other lost jewelry drawings can be bought again.
Most of the sapphire drawings are from the world, so buy those tight drawings directly from Ah. Before the seamount opens, sapphire will be the mainstream of inlay, so after it rises to 350, jewelry can have a stable income. If you want to make more money, you need to get better drawings first.