In Dalaya, there are hundreds of different gemstones, all running around, waiting to be looted by greedy players everywhere. These stones had to come from somewhere, but where? Alongside the ability to mine ore, should be that to mine gemstones as well. A separate skill that, as trained allows you the chance at getting better and better stones. Maybe you can only mine lapis at first, or jasper or malachite, but slowly, as your skill improves, the chances at getting say an emerald or a ruby increase. Special tools like a pickaxe for mining chunks of rock, and a sifter thing as a container. Add your rock, and a flask of water to the sifter, shake it about, and see what you get!