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Rock Comparison - December 2025
| 1 Best Choice  9.8Exceptional | 2  9.7Exceptional | 3  9.6Exceptional | 4 Best Value  9.5Excellent | 5  9.3Excellent | 6  9.1Excellent |
| View DealOn Amazon | View DealOn Amazon | View DealOn Amazon | View DealOn Amazon | View DealOn Amazon | View DealOn Amazon |
ModelNational Geographic Break Open 5 Jumbo Geodes - Earth Science Kit with 5 Premium, Extra-Large Geodes with Crystals, Goggles & Display Stands, Science Gifts, Fun Stuff for Kids (Amazon Exclusive) | Model National Geographic Break Open 10 Premium Geodes – Includes Goggles & 2 Display Stands - Great STEM Science Kit, Geology Gift for Kids, Break Your Own Geodes with Crystals | Model National Geographic Rock Tumbler Kit – Hobby Edition Includes Rough Gemstones, and 4 Polishing Grits, Great STEM Science Kit for Geology Enthusiasts, Rock Polisher for Kids and Adults | Model NATIONAL GEOGRAPHIC Mega Gemstone Dig Kit – Dig Up 15 Real Gemstones and Crystals, Science Kit for Kids, Gem Digging Kit, Gift for Girls and Boys, Mining Kit, Rock Collection | Model DANCING BEAR Rock, Mineral & Geodes Treasure Hunt Activity Kit (250 Pc Set) Real Shark Teeth Fossils, ID Sheet & Rock Book, STEM | Model My Book of Rocks and Minerals: Things to Find, Collect, and Treasure |
BrandBlue Marble | Brand Blue Marble | Brand Blue Marble | Brand Blue Marble | Brand DANCING BEAR | Brand DK |
Reviews | Reviews | Reviews | Reviews  | Reviews | Reviews |
Features | |||||
Worth the money 7.7 | Worth the money 7.9 | Worth the money 7.0 | Worth the money  9.1 | Worth the money 9.4 | Worth the money 8.9 |
Giftable 8.9 | Giftable 8.9 | Giftable 8.4 | Giftable 9.6 | Giftable 9.6 | Giftable 9.1 |
Tech Specs | |||||
Item Weight6.32 pounds | Item Weight 3.59 pounds | Item Weight 4.62 pounds | Item Weight 1.54 pounds | Item Weight 2.6 pounds | Item Weight 1.05 pounds |
Manufacturer recommended age8 years and up | Manufacturer recommended age 8 years and up | Manufacturer recommended age 8 years and up | Manufacturer recommended age 8 years and up | Manufacturer recommended age 3 years and up | Manufacturer recommended age - |
Product Dimensions12.2 x 3.86 x 11.02 inches | Product Dimensions 2.75 x 7.75 x 12 inches | Product Dimensions 13.81 x 4.88 x 8.06 inches | Product Dimensions 7.2 x 2.2 x 10 inches | Product Dimensions 8 x 2 x 5 inches | Product Dimensions - |
Item Dimensions LxWxH12.2 x 3.86 x 11.02 inches | Item Dimensions LxWxH 2.75 x 7.75 x 12 inches | Item Dimensions LxWxH - | Item Dimensions LxWxH 7.2 x 2.2 x 10 inches | Item Dimensions LxWxH 8 x 2 x 5 inches | Item Dimensions LxWxH - |
Size- | Size Basic | Size One Size | Size 15 Gemstones | Size Small | Size - |
Age Range Description8 years and up | Age Range Description 8 years and up | Age Range Description - | Age Range Description - | Age Range Description Kid | Age Range Description - |
ThemeGeology | Theme Science | Theme - | Theme Science | Theme - | Theme - |
Domestic Shipping- | Domestic Shipping Item can be shipped within U.S. | Domestic Shipping Item can be shipped within U.S. | Domestic Shipping Item can be shipped within U.S. | Domestic Shipping - | Domestic Shipping - |
International Shipping- | International Shipping This item can be shipped to select countries outside of the U.S. Learn More | International Shipping This item can be shipped to select countries outside of the U.S. Learn More | International Shipping This item can be shipped to select countries outside of the U.S. Learn More | International Shipping - | International Shipping - |
Review- | Review | Review | Review | Review | Review - |
Available On | Available On  | Available On | Available On  | Available On | Available On |
Our Top 3 Picks
Here are the top 3 recommended products with more information to help you find the right product for you
9.8
1Blue Marble20% OffNational Geographic Break Open 5 Jumbo Geodes - Earth Science Kit with 5 Premium, Extra-Large Geodes with Crystals, Goggles & Display Stands, Science Gifts, Fun Stuff for Kids (Amazon Exclusive)
8.9 Giftable7.7 worth the moneyMain highlights- HIGH-QUALITY EDUCATIONAL TOYS - National Geographic is proud to make the highest quality hands-on science toys, and all our products are backed by exceptional service. If your experience is anything less than extraordinary, we'll make it right!
- FULL-COLOR LEARNING GUIDE - Learn about the fascinating science behind how geodes are formed in the full-color Learning Guide. National Geographic educational toys make science and learning fun!
- DISPLAY YOUR TREASURE - Use the 3 included display stands to display your favorite crystals and geodes. A magnifying glass is also included to explore the inside of your geodes in detail.
- BIG GEODES WITH CRYSTALS - This super-fun science kit includes 5 jumbo, uncracked geodes to break open at home! Each geode is as big as a tennis ball with incredible crystals inside!
- 100% NATURAL GEODES – Kids will love the thrill of cracking open these 100% natural specimens and examining the natural beauty inside. This STEM activity emphasizes fun & discovery in a hands-on way!
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9.7
2Blue Marble
National Geographic Break Open 10 Premium Geodes – Includes Goggles & 2 Display Stands - Great STEM Science Kit, Geology Gift for Kids, Break Your Own Geodes with Crystals
8.9 Giftable7.9 worth the moneyWhy we love it
Product helps kids learn about geology and crystals
Comes with a 16 page learning guide
Satisfaction is guaranteed
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9.6
3Blue Marble26% Off
National Geographic Rock Tumbler Kit – Hobby Edition Includes Rough Gemstones, and 4 Polishing Grits, Great STEM Science Kit for Geology Enthusiasts, Rock Polisher for Kids and Adults
8.4 Giftable7.0 worth the moneyWhy we love it
simple to use
quiet
complete kit
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Features
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Consumer Reviews
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Popularity
Our system also considers the popularity of products, analyzing factors such as market presence, reputation, and user satisfaction. By leveraging AI, we capture a comprehensive picture of a product's standing in the market, which may not always be evident through traditional testing.
Value for money
AI allows us to compare products based on attributes like price, specifications, and user feedback, helping to determine their value for money. This data-driven approach offers an efficient and reliable way to assess how products stack up against one another in terms of cost-effectiveness.
