The last BOSS of YX copy will have a drawing, but all of them are blue stone cutting drawings, and all other drawings will be exchanged with Dalaran jewelry coins. There is no other way.

In addition to Dalaran, there are two NPCs for the Silver Championship and Shatas.

In fact, if you practice mining, you can also pick up some Titan minerals every day, then concentrate them, and sometimes you can choose purple stone, which is also very profitable.