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KomeStone 12000 Grit Aluminum Oxide Rock Tumbler Polish1 / 7
Product guide

KomeStone 12000 Grit Aluminum Oxide Rock Tumbler Polish

KomeStone 12000 Grit Aluminum Oxide Rock Tumbler Polish is a fine finishing powder for the last stage of tumbling prepared rocks, gems, or glass. It is presented as a refill for rotary and vibratory tumblers, with results depending on the material, earlier preparation, load, and cycle time.

At a glance

  • Intended as a final polishing stage after earlier grinding, smoothing, and regular polishing.
  • Can be used after an optional 8000-grit cycle, according to the listing.
  • Suitable for prepared quartz, agate, gemstones, and glass, including decorative and jewelry projects.
  • The maker suggests starting with about 0.05 lb of powder per 1 lb of stones and using 3–5 days as an initial cycle guide.
  • For a finish cycle, clean stones and the barrel thoroughly, follow the tumbler's water guidance, and rinse after polishing.
Price
$25.48Save 11%

Reference price: $28.48

Price checked: Nov 12, 2026

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Pros and cons

Pros

  • 12000-grit aluminum oxide offers a higher nominal grit option for a dedicated finishing cycle.
  • Listing describes use in both rotary and vibratory tumblers.
  • The resealable container is intended to make measuring batches and storing remaining powder easier.

Cons

  • A final polish is only one stage of the process and relies on suitable prior surface preparation.
  • Cycle time and finish can vary with stone type, hardness, load, equipment, and polishing time.

Technical specifications

9 specifications
Identity and material
BrandKomeStone
Abrasive and grit12000 Grit Aluminum Oxide
Intended stageStep 5 Enhanced Final Polish
Use and handling
Compatible tumbler typesRotary and vibratory machines
Suggested starting ratio0.05 lb of powder per 1 lb of stones
Initial cycle guide3–5 days
Package formatResealable container
Dimensions and installation
Weight listed1.15 pounds
Package dimensions5.2 x 3.19 x 3.11 inches

What to know before buying

Listing details to confirm

The listing calls this a 1 LB refill in its feature text and describes it as ideal for 1 lb of rocks, while the listed item weight is 1.15 pounds. These details do not establish the net powder quantity or a guaranteed batch capacity, so confirm the selected listing if the exact amount matters. The suggested 3–5-day cycle and powder ratio are starting guidance, not guaranteed settings, and results vary by material and equipment.

Who is it for?

A good fit for

  • Tumbling hobbyists who already have prepared stones and need a fine finishing powder.
  • Users of rotary or vibratory tumblers working with quartz, agate, gems, or glass.
  • Projects focused on a final surface finish for collections, decorative stones, or small jewelry pieces.

Less suited to

  • Buyers seeking a complete multi-stage grit kit rather than a finishing refill.
  • Anyone expecting a guaranteed gloss without completing appropriate earlier grinding and polishing stages.
KomeStone 12000 Grit Aluminum Oxide Rock Tumbler Polish · photo 2
Additional product photo 2

Customer reviews on Amazon

4.8 / 5 · 43 ratings
  • 5 stars88%88%
  • 4 stars10%10%
  • 3 stars1%1%
  • 2 stars0%0%
  • 1 star1%1%

Customer feedback describes the polish as effective and shiny, including a mention of a high-gloss finish. Positive feedback also highlights shine and functionality. These are customer impressions rather than guaranteed outcomes. The product is listed as a 12000-grit final-stage powder, so buyers should account for the required earlier preparation and the stated variability by material and cycle conditions.

Positive themes

  • Customers describe the polish as effective and shiny.
  • Feedback mentions shine and functionality.

Frequently asked questions

What stage is this polish for?

The listing identifies it as a Step 5 final polish, used after earlier grinding, smoothing, and regular polishing. It also says an 8000-grit cycle can optionally come before it.

Which tumblers can use this powder?

The listing says it works with rotary and vibratory tumblers. Follow your machine's water guidance.

How much powder and how long should I use it?

The suggested starting amount is approximately 0.05 lb per 1 lb of stones, with 3–5 days as an initial guide. Check progress and adjust for the material and equipment.

What materials is it intended for?

The listing names prepared quartz, agate, gemstones, and glass. The result depends on prior preparation and other operating conditions.

KomeStone 12000 Grit Aluminum Oxide Rock Tumbler Polish · photo 3
Additional product photo 3

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Offer details

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