The crafting class restrictions make sense (on their own, at least, there's a larger overall problem with the prism crafting system but this is not it). There'd be very little point in making them craftable in the first place if they were a generic item like dyes that could be made by any crafter of the requisite level. You might as well just sell them from vendors at that point. However, having the different grades makes absolutely no sense and serves no purpose other than to complicate the whole thing.
Know what a grade 2 clothcraft prism costs? Two lightning crystals, two wind crystals, two velveteen cloth, and a grade 2 clear prism. Know what a grade 5 clothcraft prism costs? Two lightning crystals, two wind crystals, two velveteen cloth, and a grade 5 clear prism.
Uh, okay, the clear prism is the only difference. The cloth and crystal requirements are identical. Fine, bit stupid but whatever. Let's check the prices of the clear prisms, then.
A Grade 2 Clear Prism is 200g.
A Grade 5 Clear Prism is... 200g.
...seriously? The final cost of the materials is *identical* for every grade of prism! What the hell is the point of having all these different grades cluttering up bags, retainers, and the market board then??
I can only assume it's a bug or typo because the grade system is totally pointless as it exists now.
On top of all this, the barrier to entry for making the prisms is incredibly low. You don't need to worry about quality, you just need to be at the right level for the recipe and have the requisite materials, and then press 1. So of course now everyone and their mother can make the prisms, there's no scarcity *at all*, and people are undercutting so much they're almost selling below cost on the Market Board. So the whole reason for making them craftable in the first place, to make them a player commodity, is ruined because (like so many other craftable things in the game) they are extremely easy to make and the market becomes flooded.
I'm not saying prisms need to have a quality requirement of 4000 or something, but they definitely should not be so easily craftable. As the system exists now, the finished prisms may as well be sold by vendors.