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National Geographic Rough Gemstones Refill Pack for Rock Tumblers — Brainfuel Toys | Educational STEM Toys for Kids, Parents, & Teachers
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NATIONAL GEOGRAPHIC Rock Tumbler Mega Refill Kit - 3lbs Gemstones of 9 Varieties Including Tiger's Eye, Amethyst & Quartz - 4 Grades of Grit, Jewelry Fastenings & Detailed Learning - Walmart.com
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