Description: 【2024 Advent Calendar】: This extraordinary Christmas gift from around the world offers 24 days of surprises for children, giving them the opportunity to , learn, collect, and create unforgettable holiday memories through play 【Rock Collection & Geology Learning】: This natural rocks and crystals advent calendar set is not only suitable for collecting but also for geology learning, stimulates children's interest in geology, and guides children to learn more about the structure and qualities of the stones 【Great Unique Jewelry】: Make this holiday season unforgettable with our gemstone advent calendar, 2024 advent calendar for kids, girls, boys, women. Each day, children open a new door to reveal the of gemstones 【Great Home Decor & Craft Accessories】: They make great aquarium rocks and are also good for plant and candle arrangements. Use them as gemstone home decor or with a jewelry making kit, carry the energy of your favorite gem with you! Advent calendar for adults who desire additional insight into their new stones 【Christmas Gifts for All Ages】: All crystals and gemstones are carefully selected, beautiful, which makes them fine Christmas gifts for 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 year old boys, girls, teens, adults, women, and men. Our 2023 advent calendar is a delightful surprise for kids, boys, girls, teenagers, and adults Specification: Material: Stone Size Chart: Box: 21.5cmx14.5cmx3.1cm/8.46inchx5.71inchx1.22inch  Package Includes: 1 Advent Calendar Gemstone Note: 1.This is not infant toy , please take away from children to avoid eating. 2.Please allow slightly errors 1-2cm differences due to manual measurement.