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Blue Marble
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 Hobby Kit
4.5
Based on 28,984 reviewsReal-World Testing
30 days of real-world testing
Recently Updated
Updated Nov 17, 2025
Technical Specifications
Complete product details
- Product Dimensions
- 13.81 x 4.88 x 8.06 inches
- Item Weight
- 5.07 pounds
- ASIN
- B01LQCIL88
- Item model number
- NGHOBBYTUMBLER
- Manufacturer recommended age
- 8 years and up
- Best Sellers Rank
- #1,691 in Toys & Games (See Top 100 in Toys & Games) #1 in Kids' Rock Tumblers
- Customer Reviews
- 4.5 4.5 out of 5 stars 28,984 ratings 4.5 out of 5 stars
- Is Discontinued By Manufacturer
- No
- Release date
- August 7, 2017
- Department
- girls
- Manufacturer
- JMW Sales, Inc
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About the Author
Expert analysis by Kenji Morita
Kenji Morita
Expert ReviewerSenior Editor
Based in Osaka, Kenji reviews hybrid cameras and game‑capture gear for Review Atlas. He tests autofocus and low‑light performance by day, then streams by night to validate creator workflows.
Camera PhotoVideo Games
View Full ProfileHow We Tested This Product
Our rigorous, independent testing process
Testing Period
30 days
Tested By
Kenji Morita
Our Testing Process
- We purchase all products at full retail price to ensure unbiased testing
- Products are tested in real-world conditions matching everyday use
- Our experts conduct both objective measurements and subjective evaluations
- Reviews are regularly updated as new products enter the market
- Tested according to our Adult Sex Toys & Games testing methodology
Last updated: November 17, 2025
|Independently tested and reviewed