For 500 or so gems you can create a special building. Ex name underground resource storage. With this building you can request resources. Only these requests cost gems. Lets say 10 or so. You can only upgrade using gems lets say first up grade is 50 then 100 then 175 and so on. Upgrades allow more space for storage and controls the amount you can request. Requests show up in clan chat and can be collected just as clan loot is.

