The National Geographic Ultimate Gemstone Dig Kit will have your kids digging and exploring for hours! The extra-large dig brick has 20 amazing gemstones hidden inside. Your kids will love discovering them all using the included dig tool and brush and then get a close-up view of each with the magnifying glass. A full-color learning guide provides fascinating facts about each gemstone, and easy-to-follow instructions make excavating each gemstone a whole lot of fun! Gemstones include two types of agate, three types of quartz, tigerÂ’s eye, snowflake obsidian, amethyst, aragonite, aventurine, hematite, desert rose, a geode piece, green fluorite, pyrite, red jasper, sodalite, turquenite, blue calcite, and labradorite.