Crack open a colorful gem surprise! Little ones get a no-mess introduction to sorting, matching, and counting with the play geodes and gems of Rock 'n' Gem Surprise from Learning Resources. Using the included play hammer and chisel, kids can crack open each reusable play geode and discover the translucent plastic gemstones inside. In addition to helping kids learn early sorting, matching, and counting skills, Rock 'n' Gem Surprise also introduces kids to early STEM and geology concepts without the messy clean-up associated with real rocks and geodes. Each of the set's two-piece play geodes pops apart and snaps back together for endless learning fun - crack 'em open again and again. Crack open eight rocks to reveal "gems" ready for lessons in color matching and shape recognition this active play set is suitable for kids aged three years and up.set includes plastic rocks with gems hidden inside in eight different colors and four different shapes: red heart, a purple triangle, a green diamond, and more fun combinations. Hammer measures 5"L, gems are 1. 5"L. Develops color, shape, and fine motor skills. Includes play hammer, chisel, and drawstring bag for storage and portable play. Pieces wipe clean for easy storage until the next sorting and matching STEM playtime.