How to buff weapons?

[LeoT444]

I want to make a character who can enchant weapons with gems, giving them some new attack effects, like when using a red gem, it will burn enemies, or when using a blue gem, it will freeze them, etc.

I was thinking of doing it like Warly's seasoning station, putting the gem in one slot and the weapon in another, and then adding the buff to it. How do I do this?