The best way to collect gemstones is to dig them up yourself. This geology kit includes 12 naturally occurring gemstones that are buried inside an easy to dig 5 x 7 inch plaster block. Look inside the gem guide and you will learn how sedimentary metamorphic and igneous rocks are created. Then learn how geodes and nodules formed by volcanic activity. One geode and/or nodule is included in each plaster block with detailed instructions on how to break it open. A geode breaking bag is included. There are over 30 different gemstones in the entire collection. Try to collect them all.