I Tried creating this myself but the only way I could think of is making one of every possible combinations of item/gems but that would be too much so, I'm gonna request it here..
System Title: Slotted items (Refinable and Embeddable)
System Description: I have at least 50 or more items that can have up to 6 slots that can have an embedded gem. I have at least 30 gems and each and every one of them has a special ability. I would like a system that enables a player to refine an item with an available slot so that he can embed gem to get special abilities but refining costs refining stones(lumber) and lubricants(food)
System Specifications:
Single player - it's for a Single player RPG and the player has only one unit that can do this.
From Shop - Refining and Embedding should be handled by shops. meaning player must go to blacksmith to refine then alchemist to embed a gem.. sum'in like that..
Tooltips - It would be great if slots, refined, slots and gems embedded can be indicated with the tooltips of the item. if not, a multiboard display is fine too..
Dunno how to describe it more but, I think you'll get the picture.. I think It's pretty complicated so, It would be fine if you'll not be able to make this..