Activating a gem
Any non-damaged gem can be magically activated by a skilled enchanter.
Activating a gem requires an enchanting kit, knowledge of the right enchantments, a high enough CL, and a gem to be activated.
A gem can produce a pure form of an element, or a variant (Such as producing alcohol instead of water).
Using multiple activated gems can produce a large variety of materials, such as a water and an earth gem can be designed to work together to produce beer or a Healing gem and a Water gem can work together to produce healing potions.
Combining elements does not ensure the quality of the resulting mixture, and as a result only ever makes the weakest or cheapest of goods.
When gems are activated, conditions must be set for them to produce material. The conditions can be as specific or vague as the enchanter wants but no gem can produce material if there is no room to do so and will not produce material if surrounded completely in its pure material (water gems still produce when in sea water, air gems produce while in smoke or steam, and so on.)