Demi III come from desynth as others have said. Most of it coming from Mor Dhona trade in but the direct for Demi III trade in, is not a true option. The items you see being asked for in trade for Demi III are NQ "fails" for the HQ requirement for the original Master 1 and 2 books. They require 2xDemi III to make. The cash in for NQ to recover one of the Demi III was put in to soften the blow.

Most use Jeweler because they decided that Artisan's Spectacles were untradeable but not unique where all the other Artisan stuff remains unique so you can only have one at a time. Long story short, you need to desynth for them.