how many pounds of rocks can the grit tumble

The instructions for the Tumbler does not give a specific weight. It recommends not filling the Tumbler barrel more than 1/2 to 2/3 full. If you overfill the Tumbler, the built-in sensor will automatically protect the motor inside by turning the Tumbler off. It further recommends if this happens you should remove some of the rocks.The grit to be used in the Tumbler comes in premeasured packets for the Tumbler size itself. I hope this helps.

Are these uncut gemstones sourced ethically? Can you provide evidence if so?

I only buy from reliable dealers. I buy a lot from National Geographic through Amazon. I’m not sure where I can find proof. I’m sorry I couldn’t give you a better answer.

Where were the rock mined?

I think they were mined in Madagascar.

Does this kit list the Mohs hardness of the different stones? I know you're not supposed to polish rocks with different hardness together

No, there is not a Mohs hardness scale included in this kit, but you should be able to locate a copy online.

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💎 Polish your passion, wear your story.

CREATE WEARABLE ART - Includes necklace, earrings, keychain, and ring fastenings to showcase your custom-crafted gems in style.
AWARD WINNING QUALITY - From Blue Marble, Toy of the Year winner, delivering educational, imaginative, and premium rock tumbling experiences.
LEARN WHILE YOU CRAFT - Comes with an engaging learning guide packed with fascinating gemstone facts to fuel your curiosity and creativity.
PRECISION POLISHING POWER - Four distinct grit grades—Coarse, Medium, Fine, Polish—ensure flawless, professional-quality finishes every time.
TRANSFORM ROUGH TO RADIANT - Master the art of gemstone polishing with 3 lbs of diverse rough stones including Amethyst and Tiger’s Eye.

The National Geographic Rock Tumbler Refill Kit offers 3 pounds of nine rough gemstone varieties, including Amethyst and Quartz, paired with a four-stage grit system and jewelry fastenings. Designed for all skill levels, it includes an educational guide and award-winning quality to transform raw stones into dazzling, wearable art.

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Material Type	Plastic
Size	3 Pounds
Number of Pieces	9
Item Weight	1.36 Kilograms
Item Dimensions	5.37 x 5.31 x 5.44 inches
Additional Features	Jewelry Fastenings
Style	Gemstone Mix
Seasons	All Seasons
Theme	Animal
Color	Multicolor

National Geographic Rock Tumbler Refill Kit – 3 lbs. of Rough Gemstones and Rocks for Tumbling Including Amethyst and Quartz – Rock Tumbler Supplies Include Rock Tumbler Grit and Jewelry Accessories

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