REVEAL A NEW GEM EACH DAY - Each day of December as Christmas approaches, kids can open a gorgeous new gemstone to add to their collection! Includes a collector's pouch to keep all your gems safe. COLLECT 24 STUNNING GEMS - The beautiful, polished gemstones for kids in this advent calendar include agate, green aventurine, hematite, sodalite, turquenite, tiger's eye, blue calcite and more! DIG OUT A SPECIAL CRYSTAL ON THE FINAL DAY - The final piece in this collection is stunning rose quartz that kids unearth from a mini dig brick, just like a real geologist! CREATE UNIQUE JEWELRY - This Christmas advent calendar includes five jewelry settings so kids can create their own special jewelry with their new gemstones! This calendar brings joy all year long! HIGH-QUALITY EDUCATIONAL TOYS - National Geographic is proud to make the highest quality hands-on science toys, and all are backed by exceptional service and a commitment to your satisfaction.