Jasper Whetstone for Edge Pro - Gritomatic

Jasper Whetstone for Edge Pro

For Hapstone and Edge Pro knife sharpeners (Edge Pro format)
Sold out


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.

    Product reviews

    Questions and answers

    If you have a question regarding this product, please feel free to ask.

    Grit chart

    Courtesy of Mr. Wizard. Please read chart explanation in README.