So the Demicrystals are bought for 50 Lore each.
And as far as I can see, no HQ version (unless it is given from IL 200+ weapons)

Did some desynthing on IL 230 Leather items and Goldsmith items and nothing special came out. Lots of Battlecraft Demimateria III. Maybe just bad luck?

Desynthed about 15 IL 180 gathering offhand items, and no demicrystals either. Just Mastercraft Demimateria, Glass Fibers, Aurum Regis Ingots, and Clear demimateria.

They don't seem to give anything special.