Specifications:Size: 24 gridProduct size:Box size: about 25x15x5cm/9.84x5.91x1.97 inchesSingle Gems Size: about 1-3 cm/0.39-1.18inchMaterial: Natural crystalsNatural crystals colors and shapes are randomDescriptionReal Natural Gems: Featuring 24 special real natural gems, each piece showcases special geological formations with preserved textures, offering high collectible value for enthusiasts and beginners alikeDaily Gems Discovery: Spark excitement with this educational calendar offering a 24-day gems discovery, blend festive cheer and developmental play to create joyful holiday traditions for kidsIdeal for Holiday Science Fun: Packed with educational info cards, this calendar sparks geology interest by teaching names and properties, providing a special and engaging method for kids to enjoy earth science during Christmas celebrationsCuriosity & Learning Tool: Strengthens family connections through nature exploration and geological adventure, while promoting curiosity, learning, and excitement of daily mineral discoveriesPerfect for Holiday: Combining education with festive charm, this countdown calendar is a considerate Christmas present that brings joy and discovery to both young and adult recipientsPacking List:1* set of Christmas Countdown Calendar