Technical Jasper Whetstone for Edge Pro

For Hapstone, TSProf and Edge Pro knife sharpeners (Edge Pro format)
$51.00 USD 📊 Grit Chart



Jasper sharpening stones are used for finish sharpening and honing knives on Hapstone and Edge Pro sharpeners. Jasper is a naturally abrasive material of high density. Jasper stones are mounted on high quality aluminum blanks.

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: 160 x 25 x 9 mm (6" x 1" x ⅓")
  • Working surface: 152 x 25 x 6 mm (6" x 1" x ¼")
  • Weight: 100 g (3.5 oz)
  • Abrasive: Сryptocrystalline Quartz
  • Extra materials: Aluminum Blank, 3M PSA

How to use

Jasper stones should be used with one of these lubricants:

  • Refined olive oil
  • Oleic aсid

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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