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JMW Sales Inc. dba Blue Marble

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  • Hobby Rock Tumbler
    Hobby Rock Tumbler
    JMW Sales Inc. dba Blue Marble

    Hobby Rock Tumbler

    $79.99

    Turn rough rocks into beautiful polished gemstones with our high-quality rock tumblers. These powerful tumbling machines are perfect for beginners ...

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  • Rock Tumbler
    Rock Tumbler
    JMW Sales Inc. dba Blue Marble

    Rock Tumbler

    $69.99

    Hidden gemstones await in this National Geographic Starter Rock Tumbler Kit. The young geologist in your life will be fascinated by the process of ...

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