I'd like to know how you applied gems, as I've completely forgotten.

Make sure the piece of gear has sockets available (you can get sockets through reforging), and then use a Smithing Table to apply gems to the gear.

There's also the Chronicles of Shadows which you can get if you have Patchouli installed, which details every part of this mod.

oh yeah, that was why it wasnt working, i remember i needed smithing table , ty