Could we have a plant / special building to "cut, polish, and sell" the gems... perhaps for coins or ingots, or even building supplies? If not, can you regulate how many gems are received in comparison to the building supplies. The ratio seems off. I end up with a ton of certain gems - primarily purple gems, but end up waiting for weeks to complete one building. Even if the ratio was changed to how often you receive purple gems compared to other gems that would be wonderful. It looks like to me that the "Popular Passion" lab potion is the only thing to spend the purple gems on. Perhaps decreasing the number of other gems required and adding some purple gems to the other potions?