Diplomacy provided mats for Biochem, Underworld Trading doesn't.
If you want to be to craft anything better than green gear you'll need Diplomacy (or have to pay allot for mats).
All the re-usable items are blue and purple quality by the way.
Thanks for the information.
I do wonder then why other people show UT instead of Dip. Maybe one did it by mistake and other people copied it? I guess it wouldnt be the first time wrong information spread like wildfire on the internet.
Again, my thanks.