Dalaran jewelry coins need to be exchanged, and a formula needs to be exchanged for four jewelry coins. The exchange position is in Dalaran jewelry trainer's room. There is a man in the room who gives you a jewelry daily task, which is to change it at his place. You can get one jewelry coin a day and four in four days, so you can change the formula. If you have money, you might as well buy more ilmenite and fry it to get ilmenite powder. You can also change 10 powder into jewelry coins, and then change jewelry coins into formulas.