Celebrate the countdown to Christmas with the crystal necklace advent calendar. This beautiful advent calendar includes an interchangeable necklace with 10 different gemstones and a handy storage bag. Each day reveals a new gemstone to add to your collection. The gemstones featured in this advent calendar are clear quartz, amethyst, sodalite, green aventurine, yellow aventurine, carnelian, hematite, rose quartz, gold tiger's eye and black obsidian.Size, shape and colour of stones may vary, making each crystal unique.