Leveling Desynthesis and Master Demimateria

[Umero]

i80 gear from old ct also give battle demimat III... so that leads to my presumption that only i90 gear gives Mastercraft demimat.

I take my word back. I Just got a mastercraft demi from artisian specs (i70 crafting gear)
so, I can now confirm that i70+ can yield either demimat 3 or mastercraft demi.
it's still uncertain that DoW and DoM gear also give mastercraft demi through desynthesis tho.