Home / Toys & Games / C1 Rock Tumbler Kit, 2.5LB Quiet Rotary Tumbler for Adults & Beginners | Complete Gem Polishing Kit with Rubber Barrel, 3 Speeds, 9-day Timer, Pause & Memory Function, and Included Tumbling Guide

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C1 Rock Tumbler Kit, 2.5LB Quiet Rotary Tumbler for Adults & Beginners | Complete Gem Polishing Kit with Rubber Barrel, 3 Speeds, 9-day Timer, Pause & Memory Function, and Included Tumbling Guide

-20% $ 55 .98 $69.98

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500+ sold last month

Description

Designed for Adults and Beginner Hobbyists – Turn rough rocks into polished gemstones with an easy-to-follow home tumbling system. The complete kit, simple controls and step-by-step guide make it easier to start your first batch while still offering enough capacity for an ongoing rock-polishing hobby.

Large 2.5 lb Capacity with a Quieter Rubber Barrel – Polish more stones in each batch with a spacious 2.5 lb barrel—a practical step up from smaller 1 lb starter tumblers. Its thick rubber construction helps cushion rock impact and produces up to 75% less noise than typical plastic barrels for a more comfortable tumbling experience in garages, workshops and hobby spaces.

Smart Controls with Pause, Resume and Memory – Choose from 3 speed settings and program each polishing stage with the clear 9-day digital timer. Pause the tumbler to check your rocks, then resume the batch without starting over. Automatic shutoff stops operation when the selected time ends, while the memory function restores your previous settings after a power interruption.

Complete Kit for Your First Tumbling Batch – Includes a 2.5 lb rubber barrel, 1 lb of rough gemstones in 9 varieties, 4 polishing grits, ceramic tumbling media, a mesh strainer, jewelry findings, an illustrated step-by-step guide and 3 drive belts. The essential supplies for completing your first polishing journey and turning finished gems into keepsakes are included.

Clear Guidance from Rough Rocks to Polished Gems – Follow the illustrated guide through each stage of the tumbling process. Each stage generally takes several days, and full results may take a few weeks depending on the rock type, size and desired shine. The tumbler is suitable for agate, jasper, quartz, aventurine, tiger’s eye，sea glass and similar hard stones.

Replacement Belts and Responsive Customer Support – Three included drive belts help keep future tumbling batches moving, while replaceable components support continued use over time. The KoolStone support team is available to help with setup, operation, troubleshooting and replacement-part questions as you build experience with the hobby.

Over 1,000,000 KoolStone Rock Tumblers Sold In The U.S. – Trusted by families and hobbyists across the country, KoolStone has helped make rock tumbling more approachable and enjoyable. The C1 combines simple controls, practical capacity and complete supplies to help new users begin tumbling with confidence. Based on internal KoolStone U.S. unit sales data through June 2026.

Official KoolStone Warranty – 𝟏 𝐘𝐞𝐚𝐫 𝐂𝐨𝐯𝐞𝐫𝐚𝐠𝐞 & 𝟗𝟎-𝐃𝐚𝐲 𝐑𝐢𝐬𝐤-𝐅𝐫𝐞𝐞 𝐓𝐫𝐢𝐚𝐥. Your purchase is protected by KoolStone’s official 𝟏-𝐲𝐞𝐚𝐫 𝐰𝐚𝐫𝐫𝐚𝐧𝐭𝐲 and a 𝟗𝟎-𝐝𝐚𝐲 𝐦𝐨𝐧𝐞𝐲-𝐛𝐚𝐜𝐤 𝐠𝐮𝐚𝐫𝐚𝐧𝐭𝐞𝐞. Shop with confidence — we’re here to support your tumbling journey.

We may earn commissions on qualifying purchases.

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G2 Dual-Barrel Professional Rock Tumbler Kit, 8LB for Adults | Brushless 8Lb (4LBx2) Rock Polisher, Heavy-Duty Metal Base, 3 Speeds, 9-Day Timer, for Big-Batch Rock Polishing

-19%

$169 .98 $209.99

100+ sold last month

Amazon

K1 Pro Professional Rock Tumbler Kit for Adults, 2.5Lb Barrel | 75% Quieter Brushless Rock Polisher, 40,000-Hour Motor Life, Pause & Memory, Complete Gem Polishing Kit, Gift For All Ages

-10%

$89 .98 $99.98

200+ sold last month

Amazon

25000 Grit Rock Tumbler Polish 5 LBS– Ultra Fine Aluminum Oxide Final Stage Powder, Step 5 Polishing Grit for Lapidary, Gemstone, Rock & Glass Surface Finishing, for Rotary & Vibratory Tumblers

-5%

$56 .98 $59.98

Amazon

-5%

$28 .48 $29.98

100+ sold last month

Lowest ever

Walmart

Hot Bee Rock Tumbler Polisher Science Kits Set for Kids and Adults, Tumbler Grits, Rocks & Jewelry Polishing Accessories Set for Beginner

-17%

$49 .99 $59.99

Lowest ever

Amazon

Large 3LB Professional Rock Tumbler Kit - Noise-Reduction & Brushless Motor Rock Polisher, Polisher with Belts, Rough Gemstones, 4 Polishing Grits with 4 Pounds Rock Tumbler Grit Kit

-30%

$110 .93 $158.47

Lowest ever

Amazon

C1 Pro Ultra Brushless Rock Tumbler Kit - Double Barrel for Extra Large 7LB Capacity, with 4 Pounds Rock Tumbler Grit Kit

-26%

$171 .35 $232.97

Amazon

C1 Pro Ultra Brushless Rock Tumbler Kit - Double Barrel for Extra Large 7LB Capacity, with 10 Pounds Rock Tumbler Grit Kit

-25%

$182 .22 $242.97

Amazon

Large 2.5LB Professional Rock Tumbler Kit, Rubber Barrel, Quiet Rotary Stone Polisher with 6 Belts, Rough Gemstones, 4 Polishing Grits with 10 Pounds Rock Tumbler Grit Kit

-20%

$90 .36 $112.96

Amazon

A1 Pro Brushless Rock Tumbler Kit - Double Barrel for Large 8LB Capacity, Adjustable Speed & Timer, Durable Metal Base for Adults & Rock Collectors – Includes Full Accessories

-15%

$169 .99 $199.99

100+ sold last month

Amazon

-5%

$27 .53 $28.98

Lowest ever

Amazon

1.5LB 12000 Grit Aluminum Oxide for Final Finish, Step 5 Advanced Polishing Tumbling Filler,Rock Tumbler Polish for Micron Finish

-15%

$21 .99 $25.99

Amazon

-13%

$12 .99 $14.95

Amazon

Rock Tumbler Double Drum 6LB Lapidary Polisher

-10%

$89 .99 $99.99

Amazon

K2 Rock Tumbler Kit+ 4 LB Rock Tumbler Grit Kit

-8%

$125 .47 $136.46

Amazon

Decorative River Rocks & Landscaping Pebbles for Potted Plants | Smooth Polished Pebbles for DIY Resin Art, Vase Fillers, Aquarium Gravel, and Potted Plants(Black, 5 Pounds)

-5%

$11 .82 $12.45

Lowest ever

Macy’s

Mindblown Motorized Rock Tumbler Set, Ages 8+

-50%

$19 .99 $39.99

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Shuttle Art Dry Markers Bundle - 15 Colors Dry Erase Markers + 15 Pack Black Retractable Dry Erase Markers

Lowest ever

Amazon

Shuttle Art Dry Markers Bundle - 15 Colors Dry Erase Markers + 15 Pack Black Retractable Dry Erase Markers

-5%

$24 .68 $25.98

Galaxy Starry Sky Night Light Projector, 2-in-1 Portable with 9 Star Light Modes and Timer, 360° Adjustable Eye‑Caring LED Night Light for Kids Adults Bedroom Home Ceiling Car Decor Gift

Lowest ever

Amazon

Galaxy Starry Sky Night Light Projector, 2-in-1 Portable with 9 Star Light Modes and Timer, 360° Adjustable Eye‑Caring LED Night Light for Kids Adults Bedroom Home Ceiling Car Decor Gift

-20%

$19 .94 $24.99

100+ sold last month

240 Pcs Permanent Markers Bulk, Fine Tip Markers in 12 Assorted Colors | Waterproof Permanent Marker with Quick Drying on Wood, Plastic, Paper, Metal for Gifts Office Home Warehouse School Classroom

Amazon

240 Pcs Permanent Markers Bulk, Fine Tip Markers in 12 Assorted Colors | Waterproof Permanent Marker with Quick Drying on Wood, Plastic, Paper, Metal for Gifts Office Home Warehouse School Classroom

-5%

$35 .99 $37.99

PAXCOO 6 Pack Jewelry Beading Wire for Jewelry Making Supplies and Craft (24 Gauge)

Amazon

PAXCOO 6 Pack Jewelry Beading Wire for Jewelry Making Supplies and Craft (24 Gauge)

-10%

$8 .99 $9.99

1,000+ sold last month

LET'S RESIN Turtle Shape Resin Molds, 3D Animal Silicone Molds for Epoxy Resin, Large Sea Turtle Marine Art Silicone Resin Molds for Craft, Ocean Theme Night Lights, Home Decor

Amazon

LET'S RESIN Turtle Shape Resin Molds, 3D Animal Silicone Molds for Epoxy Resin, Large Sea Turtle Marine Art Silicone Resin Molds for Craft, Ocean Theme Night Lights, Home Decor

-17%

$9 .99 $11.99

300+ sold last month

Crochetta Crochet Kit for Beginners, Crochet Starter Kit with Step-by-Step Video Tutorials, Crochet Animal Kits for Adults and Kids, DIY Craft Supplies, 3 Pack Halloween Pumpkins Family (40%+ Yarn)

Amazon

Crochetta Crochet Kit for Beginners, Crochet Starter Kit with Step-by-Step Video Tutorials, Crochet Animal Kits for Adults and Kids, DIY Craft Supplies, 3 Pack Halloween Pumpkins Family (40%+ Yarn)

-24%

$14 .39 $18.98

300+ sold last month