NATIONAL GEOGRAPHIC 2025 Gemstone Advent Calendar - Christmas Countdown Calendar for Kids with 24 Gems, Rock Collection, Mini
Reviewed 23 August 2026 · price checked live
Check price on Amazon →Overview
Blue Marble NATIONAL GEOGRAPHIC 2025 Gemstone Advent Calendar sits in our advent calendars listings, where we rank by how buyers actually rate a product rather than by brand. The manufacturer says: 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. The beautiful, polished gemstones for kids in this advent calendar include agate, green aventurine, hematite, sodalite, turquenite, tiger's eye, blue calcite and more! Those are the seller's own claims rather than our testing, so treat them as a starting point. On Amazon it holds 4.5 out of 5 from 4,350 ratings. What that score is worth next to its rivals is set out below.
- Brand
- Blue Marble
- Amazon rating
- 4.5 / 5 from 4,350 ratings
- vs Advent Calendars
- 0.1 above the category median of 4.4
- Rank in category
- 15 of 50 rated advent calendars we track
- How proven
- One of the most-reviewed in its category
How it compares in Advent Calendars
Across the 50 rated advent calendars products we track, the typical score is 4.4 out of 5. This one sits at 4.5, which is around the middle of the category. Ratings alone will not separate it from its rivals here, so price and the specifics below matter more than the star count.
It carries 4,350 ratings against a category median of 368. A rating from a large base is harder to distort and tends to hold up over time, so a high score here means more than the same score on a new listing.
Worked out from the 50 advent calendars products in our catalogue, not from the brand's own claims. How we rank →
Key features
- 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 JEWELLERY - This Christmas advent calendar includes five jewellery settings so kids can create their own special jewellery with their new gemstones! This calendar brings joy all year long!
- AWARD-WINNING PRODUCTS – Blue Marble, winner of the Toy Association’s prestigious Toy of the Year Award, proudly develops products that foster education, imagination, and creativity, with dedicated customer support to ensure a stellar experience!
