Hi.
I know there are different forms of shape of gems, and sockets (didn’t know where to see that) but I can’t figure out where to insert my blue square gem, I want to put it on my shield per ex. what should I input?
Also I’m aware that some gems are not compatible to some equipment, or so I’ve heard (if wrong correct me please).
The Repair NPC in Klaipeda / Orsha will handle that for you.
Thanks. 
One more question tho. Can I level up my gems while they’re in an equipment?
Nope, you have to remove them first to level them up, so you should handle that before putting them in there because a Gem that’s Lvl 1 and removed from a piece of gear will break.
Thanks again, I just figured out that the shield is not compatible with the blue square gem. Do you know a chart/guide to know which equipment have what socket shape, or is it random?
Ok i’ve found info for the different shape gems, it says insertable on ALL equipment, I don’t know why I can’t put my square gem in my shield D: