I stopped with icy prisms. They just don't seem to be worth it. I easily costs more than 40g, probably more like 50g just to keep one JC doing them daily. If I were to have 8 jc's, there is no way I could do an icy prism for less than 60g. I haven't seen a dragon's eye in a long time. So icy prisms are a lost unless I get a scarlet ruby or a dragon's eye. I can spend the time more profitably and reliably on the AH, or questing or anything else.

That said, I'm going to level up JC just for the added gem benefits and the offchance they do something like dalaran tokens again. If that happens and I'm able to do 8 quests a day, I could quickly have every cut available. That's the theory anyway.

I'd at least get the benefits from gemming out my characters, which is easily the most versatile of the crafting benefits.