The one thing gems are know for in pawnbroking, nothing else really, maybe a bon or bounty bt thats all i can think of...
Why no have an option to when building a house, or any home, that you can add gems to add a tint, or spakle to the house, make it more noticeable and different from what you can just build.
Of course the tier 1 can only be used in tier one buildings, it woud work like the tech sytem, tier IIcan have tier I or tier II gems. Different gems would add different tints or spakels, some would glo, some will darken up the place. The higher tiers will best show. After the plot is built you cant add gems, only dfuring the contruction
[:P]