Jasper Whetstone for KME

For Hapstone and KME knife sharpeners (KME format)
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Type: KME Stones



Jasper sharpening stones are used for finish sharpening and honing knives on Hapstone and KME knife sharpeners. Jasper is a naturally abrasive material of high density.

Jasper is mined in the Ural mountains in Russia. Jasper is a dense, opaque variery of cryptocrystalline chalcedony, contains significant proportion of Fe-oxides and hydroxides. Jasper does not consist of individual abrasive grains of the same size. A Jasper microquartz structure consists of a fused crystal grains of different sizes.


  • Product size: 100 x 25 x 6 mm (4" x 1" x ¼")
  • Weight: 40 g (1.4 oz)
  • Abrasive: Cryptocrystalline Silica

How to use

Jasper stones should be used with one of these lubricants:

  • Refined olive oil
  • Oleic aсid

Only one side of the stone is lapped. Opposide side is marked by slate pencil - don't use it.

Jasper stones do not have any minor defects.

Jasper stone does not require any preparations. It is naturally lapped to ultra-fine grit. This is a big advantage because the difficulty of lapping Jasper is very high.

Q & A

  • What grit do Jasper natural stones have?

    Grit terminology is not applicable to natural sharpening stones, including Jasper. The behavior of a natural stone depends on its density and how good it was lapped. However, experts estimate Jasper as 8000 - 10000 JIS.

  • About Gritomatic

    Gritomatic is not just an online shop. This private brand is a collection of high-quality, custom-made sharpening products. Gritomatic offers natural and synthetic stones, empty blanks and leather.

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