Best Komestone in 2026

We'll help with any issues. 𝐑𝐞𝐚𝐜𝐡 𝐨𝐮𝐭 𝐭𝐨 𝐮𝐬 𝐝𝐢𝐫𝐞𝐜𝐭𝐥𝐲 𝐟𝐨𝐫 𝐫𝐞𝐩𝐥𝐚𝐜𝐞𝐦𝐞𝐧𝐭 𝐨𝐫 𝐫𝐞𝐟𝐮𝐧𝐝, 𝐚𝐧𝐲 𝐢𝐬𝐬𝐮𝐞𝐬 𝐰𝐢𝐥𝐥 𝐛𝐞 𝐬𝐨𝐥𝐯𝐞𝐝 𝐭𝐢𝐦𝐞𝐥𝐲 𝐰𝐢𝐭𝐡 𝐚 𝐩𝐞𝐫𝐟𝐞𝐜𝐭 𝐬𝐨𝐥𝐮𝐭𝐢𝐨𝐧!

These grits are for 4 rounds of tumbling rocks: Cycle 1, Cycle 2, Cycle 3, Cycle 4.

Tumbling with different grits for each round help get mroe beautiful and shinning gemstones.

【POLISH YOUR OWN GEMSTONES】: Komestone tumbler kit makes tumbling even easier in an interesting way,it works for getting rouhgh and raw rocks smooth enough to use for jewlery, craft, collection, etc,. At last rough rocks will be turned out pretty gemstones with high quality and enough amount grits. Skill comes from practice.

【THE ONLY TUMBLER YOU NEED】: Built in with the super high quality motor and thicken tier level rubber barrel, both are super durable for lasting for years, three protections for water leakage is an extra big plus for years of use.

【ALL IN ONE HOBBY & EDUCATIONAL TUMBLING KIT】: Our KomeStone rock tumbler kit has everything that need for tumbling, including 1LB for 9 types of real rough gemstone rocks, the tumbler and the barrel, 3 belts and 4 polishing grits and ceramic contact media, sifter, screwdriver, Jewelry Fastenings, and illustrated tutorial guide. It's is a very decent and perfect gift for both children and adults!

HIGH QUALITY - This rock polisher grit refill pack comes with enough high-quality silicon carbide grit to put a dazzling polish on up to 20 lbs. of rocks, gems, glass, and more

EASY TO USE FOUR-STAGE ROCK GRIT - The first rock tumbling grit stage provides initial shaping, the second smooths rock surfaces, the third pre-polishes rocks, and the fourth provides the final polish

COMPATIBLE WITH ALL TUMBLERS - This complete 4-step rock tumbler grit refill kit works with all rock tumblers. For best results, use with National Geographic Rock Tumblers and rock tumbling supplies

AUTHENTIC BIRTHSTONE SPECIMENS - This dig kit is truly special! Inside the beautifully designed dig brick are 12 precious and semi-precious gemstones. Your kids will love digging and discovering these dazzling specimens!

A SPECIAL GEMSTONE FOR EVERYONE - Every kid will find their own special birthstone in this gemstone dig kit! Garnet, diamond, ruby, pearl, sapphire, amethyst, emerald, opal, blue topaz, citrine, aquamarine, and peridot are all hidden within.

A COMPLETE SCIENCE KIT - This STEM kit is easy to use, thanks to the dig tool, brush, magnifying glass, and easy-to-follow instructions. A detailed learning guide teaches kids about each stone, too. A display bottle with keychain is also included.

DISCOVER CRYSTAL TREASURES - Give your child the thrill of digging in a real gem mine as they excavate real crystal treasures. This educational engaging activity emphasizes fun, exploration, and discovery!

FIND 15 AMAZING GEMSTONES - Including pyrite, amethyst, tiger’s eye, fluorite, quartz, obsidian, aventurine, and more. Unlike other kids toys, the Mega Gemstone Dig Kit seamlessly blends educational value with fun!

A COMPLETE LEARNING ACTIVITY – This Mega Dig Kit includes everything you need to keep kids digging and learning for hours, including a dig brick packed with gemstones, a chisel, a brush, and a magnifying glass to inspect these amazing specimens!

DISCOVER CRYSTAL TREASURE - Break open these rocks to reveal amazing crystals inside! Geology doesn’t get more exciting than breaking open rocks and finding crystal treasures. Ag great STEM activity that also makes an excellent gift for girls and boys!

COLORFUL VARIETY – Geodes can form with a wide variety of crystals inside. These geodes have been hand-selected to bring you the best variety available.

100% NATURAL GEODES – These real specimens may be as big as a tennis ball, or as small as a ping-pong ball. Kids will love the thrill of cracking them open to see the natural beauty inside. This STEM activity emphasizes fun and discovery!

⭐ Non-Abrasive Ceramic Small Tumbling Media. 3/16” dia. X 3/8” long, angle cut cylinders.

⭐ Perfect for protecting stones or filling while rock tumbling. Cushions, quiets and improves tumbling action. Works with all tumbler types.

⭐ No need to keep separate for each stage – rinse and use the same batch through all the tumbling stages. Non-toxic, non-static and non-residue pellets are dryable and easy to reuse.

PUT A DAZZLING POLISH ON YOUR ROCKS with Polly Plastics rock tumbler grit and polish refill. Our one-of-a-kind rock polisher kit contains four different kinds of grits to provide initial shaping, smoothen the rock surface, pre-polish the rocks and finally polish the rocks for a professional-looking finish. Great for kids and adults alike.

PACKAGE INCLUDES - 1 lb. 60/90 coarse silicon carbide grit, 1 lb. 180/220 medium silicon carbide grit, ½ lb. 500 fine silicon carbide, ½ lb 1200 aluminum oxide polish, 1.5 lbs. non-abrasive ceramic filler cylinders and an easy-to-follow instructions manual. Polly Plastics also have 2-pack grit and polish refills available for each stage of the rock tumbling process, refills of our ceramic media and many more rock tumbling products. Check out our storefront.

GRIT SOLD BY WEIGHT NEEDED FOR EACH STEP – Steps 1 & 2 are 1 lb. each and steps 3 & 4 are ½ lb. each, but all are sold in the same size jars for packaging consistency. The different weights, along with different densities, will mean that jars of rock tumbling grit will not have equal amounts of fullness.

ENORMOUS VARIETY - This rock tumbler refill kit has 5 pounds of unpolished rocks and gemstones consisting of a 1-pound gemstone mix, 1-pound agate mix, 1-pound Madagascar mix, 1-pound jasper mix, and 1-pound petrified wood mix

ROCK POLISHING GRIT – There are 20 total rock tumbler grit packets in the kit, enough for five complete tumbling cycles with any rock tumbler

JEWELRY SETTINGS – Once your rocks are polished, use the 5 included jewelry settings to create beautiful keepsakes or use the included storage pouch to keep your favorite specimens all in one place

COMPLETE ROCK TUMBLING MEDIA KIT - 4-Step grit pack with 3 pounds of total weight. Our universal grit is designed for any rock tumbler. Get up to five tumble batches from a standard 3lb barrel.

PACKAGE CONTAINS - 1 lb. 60/90 Coarse Silicon Carbide Grit, 1 lb. 180/220 Medium Silicon Carbide Grit, ½ lb. 500 Fine Silicon Carbide, ½ lb. 1200 Aluminum Oxide Final Polish.

GRIT SOLD BY WEIGHT NEEDED FOR EACH STEP – Steps 1 & 2 are 1 lb. each and Steps 3 & 4 are ½ lb. each but all are sold in the same size jars for packaging consistency. The different weights, along with different densities, will mean that jars will not have equal amounts of fullness.

REAL GEMSTONES FROM MADAGASCAR - 3 pounds of raw rocks includes rose quartz, labradorite, red jasper, yellow jasper, indigo gabbro, and polychrome jasper, quantities of each gemstone may vary

FOUR GRADES OF GRIT - Coarse, Medium, Fine, Polish. Transform your raw stones from rough rocks to dazzling gemstones, this refill kit also works with all rock tumblers

JEWELRY FASTENINGS - Additional rock tumbler accessories include 1 Necklace, 1 set of Earrings, 1 Keychain, 1 Ring to create custom jewelry from your newly polished gemstones

THE ULTIMATE ROCK COLLECTION KIT - This STEM science kit lets kids explore 2 pounds of magnificent geological specimens! These include agate, amethyst, blue quartz, rose quartz, tiger's eye, sodalite, hematite, various jasper varieties, and more!

POLISHED GEMS REVEAL HIDDEN BEAUTY - This collection of stones and crystals is dazzling! The polished luster of the rocks and crystals in this kit make it possible to see minute details, revealing the hidden beauty of each rock and crystal inside!

GREAT HOME DECOR AND CRAFT ACCESSORIES - These rocks and crystals have many uses! They make great aquarium rocks, and are also good for plant and candle arrangements. Use them as gemstone home decor or with a jewelry making kit! The possibilities are endless!

COMPLETE KIT - 4 Step grit pack and plastic filler for use in 15 lb. tumbler or five 3 lb. tumbles.

CONTAINS - 1 lb. 60/90 Coarse Silicon Carbide Grit, 1 lb. 180/220 Medium Silicon Carbide, Grit, ½ lb. 500 Fine Silicon Carbide, ½ lb. 1200 Aluminum Oxide Polish and 1 lb. of premium high-impact polypropylene plastic filler pellets. Protect and cushion fragile stones and reduce tumbling noise.

GRIT SOLD BY WEIGHT NEEDED FOR EACH STEP – Steps 1 & 2 are 1 lb. each and Steps 3 & 4 are ½ lb. each but all are sold in the same size jars for packaging consistency. The different weights, along with different densities, will mean that jars will not have equal amounts of fullness.

GEMSTONES OF NINE VARIETIES: Tiger’s Eye, Amethyst, Aventurine, Rose Quartz, Red Jasper, Agate, Sodalite, Dalmatian Jasper, Black Jasper. (3lb in total)

FOUR GRADES OF GRIT: Coarse, Medium, Fine, Polish. Transform your stones from rough rocks to dazzling gemstones!

JEWELRY FASTENINGS: 1 Necklace, 1 set of Earrings, 1 Keychain, 1 Ring. Create custom jewelry from your newly polished gemstones!

TWO LBS. Clear poly pellets. Use to fill tumbler to improve tumbling action.

PREMIUM High Impact Polypropylene. Stands up to rough tumbling action. Protect and cushion fragile stones and reduce tumbling noise.

Non-toxic, non-static and non-residue pellets are dryable and easy to reuse – float to the top for easy cleaning.

GEMSTONES, CRYSTALS, AND FOSSILS FOR KIDS - This kit is the perfect starter set or addition to any kid’s rock collection! It contains hundreds of real gems, cool rocks, and genuine prehistoric fossils and fascinating insight into each specimen.

A GEMSTONE DIG KIT THAT KIDS LOVE! This awesome science kit gives your child the thrill of digging in a real gem mine! They'll dig like real geologists with the included tools. Imagine discovering 15 awesome gemstones in this incredible dig brick!

CRYSTAL GROWING KIT WITH LIGHT-UP DISPLAY - Grow three vibrant crystals, then show them off on a sleek light-up display base! Kids get to see crystals take shape before their eyes, and will learn all about crystal science in our learning guide.

Complete rock tumbling medium kit: 3.5 lbs. 4-step grit set and poly plastic pellets, to polish any rock. Packaged in easy-to-use-and-store bottles

Includes: Step #1 Coarse Grit (1 lb.), Step #2 Medium Grit (1 lb.), Step #3 Pre-polish Grit (1/2 lb.), Step #4 Grit (1/2 lb), Polypropylene Plastic Poly Filler Pellets (1/2 lb.), Instruction Guide

Compatible with all rock tumblers: Can be used in tumblers from any brand: Dan&Darci, Elenco, Lortone, National Geographic, Smithsonian, Thumler and more

GEMSTONES OF 9 VARIETIES - Tiger's Eye, Amethyst, Aventurine, Rose Quartz, Red Jasper, Agate, Sodalite, Dalmatian Jasper, Hematite. (1lb in total)

FOUR GRADES OF GRIT - Coarse, medium, fine, polish. Transform your stones from rough rocks to dazzling gemstones!

JEWELRY FASTENINGS - 1 necklace, 1 set of earrings, 1 keychain, 1 ring. Create custom jewelry from your newly polished gemstones!

[5 STEPS] Just measure in the grit, add enough water to cover the stones, seal the barrel, and tumble. The only variable is how much of the product to use in your rock tumbler. We suggest 2 tbsp of grit per pound of stones, which is a good rule of thumb.

[COMPLETE KIT] 5 Step grit pack and ceramic filler for use in 15 lb. tumbler or five 3 lb. tumbles. Coarse Grit, Medium Grit, Pre-polish Grit, Grit, Polypropylene Plastic Poly Filler Pellets and Instruction Guide.

[EASY TO USE] Includes a clear instruction guide on how to use the grits and plastic pellets.Large Amount of Grit, This is a large amount of each size grit for the price.

A HOBBY THAT LASTS A LIFETIME - Rock and mineral collecting is a popular hobby, and this rock collection kit is the perfect way to inspire a lasting love of geology! This geology kit will soon be your kid's most prized possession!

AWESOME ROCKS AND MINERALS - This 15-piece rock collection features incredible rock and mineral specimens including desert rose, tiger's eye, red jasper, rose quartz, pyrite, green fluorite, blue quartz, green aventurine, and more!

EVERYTHING YOU NEED - In addition to the incredible rocks and minerals, you'll also receive a clear storage box and 1 storage pouch. A full-color learning guide allows your kids to learn about each rock and mineral and easily identify each specimen.

Belts are consumables, so we'd like to offer extra 5 belts for spare use. 𝐏𝐥𝐞𝐚𝐬𝐞 𝐚𝐝𝐝 𝐭𝐡𝐢𝐬 𝐥𝐢𝐬𝐭𝐢𝐧𝐠 𝐭𝐨 𝐲𝐨𝐮𝐫 𝐰𝐢𝐬𝐡 𝐥𝐢𝐬𝐭 𝐚𝐧𝐝 𝐭𝐡𝐞𝐧 𝐫𝐞𝐚𝐜𝐡 𝐨𝐮𝐭 𝐚𝐭: 𝐬𝐮𝐩𝐩𝐨𝐫𝐭@𝐢𝐤𝐨𝐨𝐥𝐬𝐭𝐨𝐧𝐞.𝐜𝐨𝐦 𝐭𝐨 𝐠𝐞𝐭 𝐭𝐡𝐞 𝐟𝐫𝐞𝐞 𝐛𝐞𝐥𝐭𝐬 (𝐰𝐨𝐫𝐭𝐡 𝟏𝟐𝐔𝐒𝐃).

2 Years Warranty - Special Bonus Just for You! The warranty covers accessories replacement, techical support, 𝟐𝟒/𝟕 𝐜𝐥𝐚𝐢𝐦 𝐡𝐨𝐭𝐥𝐢𝐧𝐞 and so on. 𝐌𝐚𝐤𝐞 𝐲𝐨𝐮𝐫 𝐦𝐨𝐧𝐞𝐲 𝐰𝐨𝐫𝐭𝐡 𝐞𝐯𝐞𝐫𝐲 𝐩𝐞𝐧𝐧𝐲.

START A TUMBLING JOURNEY -- Koolstone Rock Tumbler turn rough rocks into polished gems, then you will be very excited to see the stones change with each cycle. That's a fun process of rock tumbling and a family little project for parent-child endeavor.

IMPROVE YOUR ROCK TUMBLING RESULTS – Ceramic tumbler media makes the entire rock tumbling process more effective, improving delivery of rock tumbling grit, quieting tumbler noise, reducing rock breakage, and acting as a filler for smaller batches.

A LITTLE GOES A LONG WAY – Rock tumbling ceramic pellets are reusable and can be used during every rock polishing grit cycle. Ceramic polishing media is more effective than plastic tumbling media and will never stale or spoil.

COMPATIBLE WITH ANY TUMBLER – These rock tumbler ceramic pellets are safe to use with any rock tumbler. This versatile rock polish accessory is a fantastic addition to your stock of tumbling supplies.

⭐ Non-Abrasive, Ceramic Large Tumbling Media. 3/8” dia. X 5/8” long, angle cut cylinders.

⭐ Perfect for protecting stones or filling while rock tumbling. Cushions, quiets and improves tumbling action. Works with all tumbler types.

⭐ No need to keep separate for each stage – rinse and use the same batch through all the tumbling stages. Non-toxic, non-static and non-residue pellets are dryable and easy to reuse.

⭐ Non-Abrasive Large Tumbling Media. 3/8” dia. X 5/8” long, angle cut cylinders.

⭐ Perfect for protecting stones or filling while rock tumbling. Cushions, quiets and improves tumbling action. Works with all tumbler types.

⭐ No need to keep separate for each stage – rinse and use the same batch through all the tumbling stages. Non-toxic, non-static and non-residue pellets are dryable and easy to reuse.

Mega rock, fossil & mineral collection kit: We've done the traveling and sifting through all that dirt for you, and collected this incredible collection of 250+ special minerals, fossil and gems just for you!

Jumbo learning mat: We've given you lots of mysteries to solve, and a huge learning mat to use to compare what you find to their pictures and learn fascinating facts.

Premium value: Includes select rough rocks and minerals, select polished rocks and minerals, select genuine fossils, an assortment of mixed rocks and minerals, jumbo learning mat, magnifying glass, fossil display case, collector's pouch.

Silicon Carbide Aluminum Oxide Rock Tumbling

Comes with FREE Polishing Instructions

Compatible with all tumbler brands

Premium Rock Tumbling Media

Protects & Cushions Stones

Improves Tumbling Action

EXPLORE CRYSTAL CAVES - Geodes are naturally forming volcanic rocks that contain amazing crystal formations inside. Crack them open and discover beautiful minerals!

PREMIUM QUALITY - National Geographic selects only the best geodes collected from multiple mines around the world, so you’re guaranteed to find fascinating crystals

INSPIRING A GENERATION – Kids love these treasure-filled rocks! Encourage an appreciation of nature and geology in your child with this extraordinary science kit

★【4 Steps】Be Patient. There are 4 total cycles, 7 days each to have pretty rocks / gems. Step 1, 60 Coarse Silicon Carbide Grit. Step 2, 220 Medium Silicon Carbide Grit. Step 3, 500 Fine Silicone Carbide Grit. Step 4, 1200 Aluminum Oxide Grit. Just measure in the grit, add enough water to cover the stones, seal the barrel, and tumble. The only variable is how much of the product to use in your rock tumbler. We suggest 2 tbsp of grit per pound of stones, which is a good rule of thumb.

★【Large Amount of Grit】This is a large amount of each size grit for the price. This kit comes with enough grit to complete approximately 16-20 lbs of rocks. This kit contains 2 lbs 60 Coarse Silicon Carbide Grit, 2 lbs 220 Medium Silicon Carbide Grit, 1 lb. 500 Fine Silicone Carbide Grit, 1 lb. 1200 Aluminum Oxide Final Polish Grit. COMPATIBLE WITH ALL BRAND TUMBLERS.

★【Jars, Labels & a Scoop】Nice hard plastic jars with lids (as opposed to plastic bags). Bottle caps are very secure. Definitely they will not leak. Use the amount you need and set it back on the shelf for the next round. A scoop is included for the correct dose. No need to pour the material out, which possibly make a mess while doing so. They are neatly packaged and easy to read labels. Tip: you could put your tumbler on a foam pad to eliminate noise.

POLISHING BARREL – This rock tumbler barrel allows you to polish like a pro. We recommend having a dedicated barrel that is only used for the final step in the polishing process to avoid leaving any remnants of rougher grits that might scratch your gemstones and diminish the final polish.

REPLACEMENT PART – Barrel is compatible with the National Geographic Professional Rock Tumbler and Hobby Series Tumbler as well as the Discover with Dr. Cool Professional Rock Tumbler and Hobby Series Tumbler

QUIET AND CONVENIENT – Constructed of durable rubber and with a leak-proof lid, this barrel is designed to be low-noise and easy to use