This is natural material that we separate out and drill in house. Most of it consists of nuggets, leaves, flats, and some Blueberries. This material we do not finish or polish in any way besides drilling it. For people that want to enhance the natural colors to make them more vibrant, we have found that the following produce very good results: spraying the stones with food grade silicone, sealing with tile grout sealer, oiling with mineral oil or tung oil, or waxing with a carnauba  based paste wax.