Learning Resources Rock 'n' Gem SurpriseCrack 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. Using the included play hammer and chisel, kids can crack open each reusable play geode and discover the translucent plastic gemstones inside. Gems double as manipulatives, and come in eight different colors and four different shapes you might find a red heart, a purple triangle, a green