[PvK]

I tend to dislike games where "you can buy anything with enough money", so I think I prefer not to be able to alchemize gems. However an international gem trade of some sort might be reasonable. Various ways that could work. You can currently do so in MP but the exchange is entirely on a trust basis. Which is limited but ok.

Items that increase resources... a magic forge or something? That could be ok if it was limited well enough. It might be best if the increase were percentage-wise rather than absolute, or were a very small number, and/or if only one were effective per province, and/or it were a unique item (or 2-3 unique items). Again, there are interesting limits and balances in the existing system, which this ability could bland-ify unless limited. One benchmark to playtest would be Ulm - who should not be able to become much more powerful by mass-producing these, I would think.

PvK