Use the hammer and chisel to mine for your hidden stone or genuine diamond. Each box contains one of six collector specimens (red onyx, picture jasper, black line jasper, tiger eye, volcano rock or rose crystal) or a real diamond! You have a 1 in 24 chance to uncover a diamond. Each comes with 3 specially designed tools to help you on your dig: hammer, chisel and brush. Makes a great rainy day activity, impulse gift or party favor. Ages 5+.