Boker Belgian Whetstone Ardennes Coticule, 8000 Grit, 6.8" x 1.5", Great Razor Stone - 09BB002


MSRP* : $149.95 | You Save* : $37.49 (25%)
Part #: BO09BB002 | Boker Knives
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BO09BB002: Belgian Whetstone Coticule


"Belgischer Brocken" (Belgian Whetstone)

Exclusive traditional whetstone from a small area in the Belgian Ardennes. Proven for generations, and famous for the unique material used, efficiency, and perfect results.

Belgian Whetstone Coticule

The traditional yellow whetstone is, in nature, only available in thin layers and is thus mounted on a piece of slate. With the high content of garnet (35%-43%), the whetstone works effectively and provides excellent results. 8000 grit. Comes in an attractive wooden box. Length: 6-7/8". Width: 1-1/2". Thickness: 3/4". Weight: 16 oz. From Belgium. Boxed in Solingen, Germany. The yellow stone is mounted on a slab of schist that is not usable and so these are not double sided whetstones.

To the noblest "natural sharpening system" of the world.

The legendary stone has been used over 400 years to sharpen knives and tools.

Your guarantee of quality and sustainability of the natural materials and the simple and user-friendly handling.

Take the traditional way to sharpen your knives and tools.

Every Coticule stone is completely hand made at Ardennes Coticule so every Coticule stone is a one of a kind!

Ardennes, founded in 1998, continues the activities which were started in 1865 by the original work shop ‘ateliers Burton’. This involves the exploitation of the quarries and the production and sales of schist for different applications. Ardennes is specialised in the well known whetstone Coticule or Belgian Sharpening Stones.

When using these whetstone the crystals are released from the stone itself and produce together with water a very “abrasive milk”. grenatsIn crystal form the Garnet is round or slightly oval and resembles a football (5-20 micron), made up of tiny facets (Rhomboid). These facets create obtuse angles to each other, and it is these corners which are in contact with the metal to be sharpened. These attributes are why the stone sharpens so quickly and delicately.

The yellow whetstone: Coticule

This is the traditional whetstone that contains 35 to 40 % of garnets which gives it the best grinding characteristics. Because of the odd nature of the environment the Coticule is found in the thinner layers, because of that it needs some work; the gluing and shaping.

Why does the yellow stone sharpen so fast and delicately ?

This is because of the garnets. As soon as you start sharpening, the garnets leave the stone. Blended with water they form a very abrasive paste. The garnets have a round to oval shape with a dodecahedral structure. They can be compared with a football which consists of a lot of small leather planes, stitched together to form a round object. If the diameter of the garnets is for example 15 microns, only 2 to 3 microns of the obtuse angles of the garnets penetrate into the object while sharpening. In this way, the yellow stone sharpens fast and delicately at the same time.


Can I use water and oil at the same time ?

Yes, you can. If you already have the habit to use oil, you can go on with this. Nevertheless, water is sufficient.

How can I make the surface flat again ?

Put a piece of abrasive paper on a flat surface. Add some water and rub the stone over the paper. It’s advised using abrasive paper with sand grains of +/- 80 to 100 micron.

Does the stone get clogged ?

No, Coticule is a non porous stone so it can’t get clogged.

What’s the life span of the stones ?

At least 10 to 20 years! In case of intensive use, its life span will decrease.

UPC Code: 788857018422

Boker Belgian Whetstone Ardennes Coticule, 8000 Grit, 6.8" x 1.5", Great Razor Stonerated 4.000 stars out of 5 (3 reviews)
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Boker Belgian Whetstone Ardennes Coticule, 8000 Grit, 6.8" x 1.5", Great Razor Stone
rated 3 stars out of 5
Dunedin, Other
Nov 25, 2013
Pros: Durability, Ease of Use, Effectiveness, Overall Quality
Cons: None
Really good quality, really bad value.
I was really excited to receive this stone, as it was to be my first 8000 grit stone (which is supposedly 3 microns). I was extremely disappoint to find that the edge it put on your knife was equal to that of a 2000 grit stone which if had bought one of it would have cost me $30 instead of $100. There are saw marks where the stone was cut but that doesn't bother me cause I use it for bushcraft, camp, and survival knives. I really enjoy how you only need to coat the stone in water to sharpen it instead of soaking it for ages like some other stones. I would definitely recommend against buying this stone unless you are prepared to spend $100 on a 2000 grit stone.
Boker Belgian Whetstone Ardennes Coticule, 8000 Grit, 6.8" x 1.5", Great Razor Stone
rated 4 stars out of 5
Paris, France
Jun 16, 2013
Pros: None
Cons: None
Fact to be noticed about Belgian coticule
I write from a place where it is a pink translucent arkansas wich is 'exotic', not this well known yellow coticule from my belgian neighbours ;)To be noticed : for straight razors only or wedge profiled japanese kitchen knives, or 'light' dead-end finishing touch on knives for experienced user, as flatness of the stone itself can be damaged if used for a dull 8+ randall blade reaching 30degrees ....This stone by Boker is in the middle + category of the quality ranking for belgian coticule; immaculate light yellow can be found but prices are sky-rocketting quickly when size and quality improve.sharpening this way can be addictive quickly as, with time, you learn how to 'custom' your own grit with the good amount of water (in spray) an a small piece of rich coticule. you'll reach the best from your blade, before mirror polishing by naked leather strops.By itself, can totally transform your experience in shaving.
Boker Belgian Whetstone Ardennes Coticule, 8000 Grit, 6.8" x 1.5", Great Razor Stone
rated 5 stars out of 5
Feb 10, 2012
Pros: Durability, Ease of Use, Effectiveness, Overall Quality
Cons: None
coti bliss
i use this for straight razors... it leaves a beautiful wickedly sharp edge.. mine is a natural combo stone so it has the belgium blue whetstone side also..there is NOTHING bad about this stone..i love this stone!


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