Doing wiki unlocks as you find them in game would work but more for a Bestiary sort of thing, in this case/game it takes place in a single town/region so I don't think would work. But I could think of someting.
Gems are used individually, you can't fuse them. Each character can place gems in armor sockets, 6 slots in total (head and feet = 1 each, shirt/leggings = 2 each). It's really not much, since differently from my other games your party is only 3 characters, and also it's not like you'll be swapping gems all the time (they're rare to find).
Of course I can always reduce the socket number and make the gems more powerful to balance it, in case people tell me it's too much work. Gems will be mostly used by Nightmare mode players anyway
