National Geographic Gemstone Advent Calendar - Christmas Countdown Calendar for Kids, 24 Gems to Open Each Day, Complete Rock Collection Reveal a new gem every day As Christmas approaches, every day in December, kids can open a gorgeous new gem to add to their collection! Includes a collector's bag to keep all the gems safe.Collect 24 stunning gems This advent calendar features beautifully polished children's gems including agate, green aventurine, hematite, sodalite, green calcite, tiger's eye, blue calcite, and more!Dig up a special crystal on the last day The final gem in the collection is a stunning rose quartz, which kids can unearth from a mini digging brick, just like real geologists!Create one-of-a-kind jewelry This Christmas advent calendar includes five jewelry settings so kids can create their own jewelry with new gems! This calendar brings joy year-round!Award-winning products Winner of the National Toy Association's prestigious Toy of the Year Award, proudly develops a line of products that foster education, imagination, and creativity, backed by a US-based support team to ensure a first-class experience!