Dieter Schmid's Fine Tools
Japanese Natural Waterstones

Japanese Waterstones: Natural Waterstones

For many years we were reluctant to offer natural Japanese sharpening stones. We had several reasons.

For one: at Fine Tools we offer a very wide variety of man-made waterstones, from a number of different manufacturers that cover any possible functional need many times over, and so we just felt no need for natural stones.

Secondly: with man-made stones we know that they are going to be consistent and will always offer the same sharpening characteristics, from the beginning to the end of their working life when they have become thin. With natural stones, we cannot know this, because with a stone - even though it looks really good - we can only see the surface. As the stone wears in use, sometimes the next layer can have much different sharpening characteristics, or there can be a very hard inclusion or other irregularities that can greatly limit the usefulness of the stone.

And thirdly: we don’t know enough about the individual stones to be able to assess them reliably, to know what we would be selling and whether they are really worth your money! Especially since every stone is different and as we said, can change with use. If we buy a box of 20 artificial stones, and we test one and it is of excellent quality, we can normally assume that the other 19 will be the same. With natural stones, this is not so. It would theoretically be possible to test each stone, but this would drive the prices still higher. It would also erase the quarry stamp on the surface of the stone, and with it the proof of the stone’s origin.

So why are we offering them now(1)? With manufactured stones, we can expect very little new in the future. And to just sell our current line, and discover nothing new, is for me, to be honest, just too boring in the long run. As it happened, I found a man who makes the rounds of the various quarries, and is very good at judging the quality of the stones by sight and feel. He mostly buys individual stones that he judges to be exceptionally good. This sparked my interest, and so now I am offering a few of these stones for sale in my store.

So why now(2)? A while back, I began to think of natural sharpening stones as an enormously important cultural asset. They have played a largely unsung, but big, role in the technological development of humans. When one thinks about sharpening stones, there is a real sense in which they made it all possible especially in terms of working with metal. No farming without the proper tools, no woodworking without sharp planes, chisels, and saws, mealtimes would be very different without sharp hunting and cooking knives. Sewing requires sharp needles. Cutting tools and their sharpening stones built the basis for the development of many kinds of traditional handwork and specific skills. The need to find a suitable abrasive is very closely intertwined with the development of tools in general and dates back many thousands of years. Even today “high tech” man-made sharpening stones are praised by saying "It grinds like a real stone," that is, the manufacturer found the right materials to allow their stones to mimic the "HighTech" natural stones in use for thousands of years.

Who are these stones for? For beginners, it is best to work at first with relatively inexpensive artificial stones. With these stones most people can achieve a very respectable and useable edge on knives and woodworking tools. But a fair number of people over time become unsatisfied with “useable,” and as their working skills improve, so does their feel for sharpening, and they need better sharpening stones. For these folks, we recommend our high-end artificial stones, and for many these are a revelation. We often get correspondence from customers saying that our high-quality stones had allowed them to achieve a precision and sharpness with their cutting tools that they had not imagined possible. If you get to that level, and you are still curious, and you want to explore further, while knowing that natural stones can be unpredictable, then experimenting with these beautiful natural stones might be a very interesting next step.

The Three Steps in Sharpening: Archaeological digs into prehistoric sites have not only revealed an active tradition of blacksmithing dating back to the late Jomon Period (1,000 - 300 BC), but research has also found evidence that even then the sharpening process was divided into the three steps - roughing out, grinding, and honing - that are still normally used today. One can assume that the sharpness that could be achieved with a fairly coarse or medium grinding stone would have been considered adequate at first, and then as the culture developed, higher standards of sharpness would have been needed. The abrasive material in natural sharpening stones consists of very fine round grains of silicate with a size range from 0.2 to 0.3 microns (according to Japanese sources) and these are combined with a small amount of iron oxide or other natural materials that improve the grinding effect.

Appearance and Quality: A natural Japanese sharpening stone, which can be considered perfect and has all the necessary attributes, can cost a fortune. It would have a very consistent grain, be uniform in texture and color (preferably yellow), would have no cracks, stains or other blemishes, and is over all a very beautiful stone. Such a stone is known as a "practical Diamond" in Japan, and they turn up maybe once a century. Normally natural stones are nowhere near perfect in appearance. The color can be various shades of yellow, brown or gray, can be different in different areas of the face of the same stone and can change with use. The edges and corners are often rough and uneven or chipped. But surprisingly, the quality of edge that can be obtained with these more common stones is often very close to that of the so-called "perfect" stones.

Origin and Cut: Take into account that the quarries for natural stones have often been mostly exhausted, and it is very difficult today to get really fine stones. The names of the stones generally come from the mountain where they were quarried. Here are some examples of names from Kyoto and its surrounding region:

Western mountains: Ohira, Shinden, Mizukihara
Central mountain: Atago
Eastern mountains: Nakayama, Ozuku, Kizuyama, Okudo, Shoubu, Narutaki

Currently nearly all quarries are closed. But there still exists a lot of raw stone material mined in the past waiting for being cut to appropriate sizes.

The stones are cut horizontally, so that the layers of sediment are parallel to the stone’s face in order to present a consistent grit size and quality. This can be compared to flitch-sawn wood.

Wetting the stone: The ideas on how long before use one should put natural sharpening and honing stones in the water are, even in Japan, very different. There are professionals who speak of 2 weeks! Others advise at least 30 minutes, and yet others who say that simply wetting the surface of the stones works just fine. Our advice: put the natural stones in a water bath for at least 30 minutes before use. If once you have used the stone for a while, you have the feeling that it is not enough, then you can try up to 24 hours or even longer if needed. The proper watering time serves to stabilize the structure of the stone to allow consistent results. It is important to remember that these are natural stones, every one is different, and so each has a different need for water. Harder stones, for instance, need more time in the water than softer ones.

Storing the stones - wet or dry: In Japan natural sharpening and honing stones are normally stored dry and out of the sun after they have been flattened and the grit paste has been removed. They should never ever be exposed to freezing temperatures when wet. The water in the stone will freeze, expand, and this will damage or break the stone. Also, avoid rapid changes in the temperature or drying them out too quickly. Never put one on or close to a strong heat source! Naturally, they can also break if dropped onto a hard surface.

But, recognized and respected experts in Japan also - contrary to what we have written above - say that regularly-used natural stones can be left permanently in the water. They base this advice on the idea that, contrary to the various kinds of artificial stones which can be damaged if left in the water too long, natural stones can withstand this treatment in that they are in principle stones that were formed under water (sedimentary stones). While all this is true in principle, we feel very strongly that dry storage is the best way for the following reasons.

Natural sharpening stones are normally composed of about 2/3 SiO2 (Silicon-dioxide), which provides the sharpening grit, and about 1/3 KAl2AlSi3O10(OH)2 (Sericite, finely rippled Muskovite) which serves as a binding material. The stones were formed about 70 million years ago. As they were formed from sediment laid under water, one would think they would be stable when wet. But after the stones have been quarried and cut to size this can change, as the binding material, which is at least in part water soluable, can dissolve over time and the abrasive particles can flake off unevenly. This decomposition process normally takes place over many years, and so if the stones are in use every day, it doesn’t matter much at all. But for most people today, to respect the investment in the stones and their quality and rarity, it is best to store them dry to avoid any possible damage.

Dressing and flattening: This theme is too often, and unfortunately, neglected, even though the lack of advice can mean bad or inconsistent results when you use the stones to sharpen tools. By dressing and flattening we mean the long-term care of the stones, and not just tuning them up for their first use. When the stones are used for sharpening, a hollow develops in the surface of the stone, and the hollow causes problems when sharpening tools and knives. One must also understand the difference between sharpening knives and woodworking tools like plane irons and chisels. Knife blades mostly have a slightly convex shape and so an absolutely flat surface on the stone is not so important. With woodworking tools though, it is important that the stone’s surface is flat so that the bevel and back of the iron can be sharpened straight and flat. This allows the maximum precision when working wood with these tools. A hollowed stone, even when you can barely see the groove, will cause problems with the different types of plane irons and chisels.

There are different methods to flatten or dress the stones. For us, there are two practical and effective methods: other sharpening stones and diamond plates.

Fine natural honing stones can be flattened with a medium-grit (600-1000) sharpening stone: both natural and artificial stones work well, and harder stones are better than softer varieties. The most effective option is however a diamond plate of between 400 and 600 grit. If the stone has a deep hollow, and a lot of material needs to be taken off, then a coarser dressing stone should be used. Grinding stones of 120 grit or a diamond plate of about 140 grit are good for this kind of job. When flattening coarse natural grinding stones, like Igarashi, Natsuya or Amakusa, you always use a coarse stone, of similar or larger grit size.

It is always a good idea to thouroughly rinse the stone after flattening it. If this is not done, often you will find that some of the coarser grit stays on the surface of the finer stone and leaves ugly scratches on your tools or knives. Since the surface or your grinding or sharpening stone was roughened up by flattening with a coarser grit, you can smooth the surface using a Nagura stone, gently, without pressure. The result will be a fine abrasive slurry that is perfect for sharpening. Depending on the type of stone and the steel to be sharpened, sometimes you need to add a bit more water after dressing with the Nagura stone. Toward the end of the sharpening process, it is best to reduce the pressure on the tool, which will tend to polish the edge and leave a mirror surface on the steel.

Tip: It is a good idea to get in the habit of flattening your stones after each time you use them. This takes advantage of the fact the stone is already wet and uses the abrasive slurry from the sharpening session. The stone is then rinsed thouroughly and put aside, ready to go when you need it again. How often do you see hollow stones laying around workshops? This often leads to putting off sharpening a tool that needs it, or the sloppy habit of a hurried sharpening on a hollowed stone because it makes a mess and takes time to flatten the stone. Either way, the job cannot be done right and poor work will be the result.

Ozuku Natural Stone nr. 315791
Ozuku Natural Honing Stone Grit size (estimated): more than 7000
Size 75 mm x 206 mm x 45 mm
Weight 1837 g
Rear view
Note: every stone looks different! The stone for sale here is the one in the photo.
Characteristics: Surface interveined, visible when you enlarge the picture. One edge chipped off. Another edge with recess 25 x 10 mm wide and 2 mm deep, covered by the label. Apart from that surface very fine and homogenous.
Colour: light grey
Code 315791CartPrice € 459.00
Ozuko Natural Honing Stone Nr. 315700
Ozuku natural honing stone Grit size (estimated): approx. 6000
Size 75 mm x 205 mm x 40 mm
Weight 1551 g
Note: This stone was in use for testing purpose.
Rear view         View before in use
Note: every stone looks different! The stone for sale here is the one in the photo.
Characteristics: On the face there is a triangular piece missing, 10 mm on it’s longest side. The surface is very fine and homogenous.
Colour: yellowish-grayish with red flecks and reddish sediment layers several millimeters under the face.
Code 315700CartPrice € 525.00
Ohira natural honing stone code 315706
Ohira natural honing stone Grit grade (estimated): approx. 6000
Size 75 mm x 205 mm x 40 mm
Weight 1555 g
Note: This stone was used for testing.
Rear view  -  View prior to testing
Note: every stone is different! The stone for sale here is the one in the photo.
Distinguishing features: the face is missing a corner with a side length of 10 mm. Nearby is a 15 mm long crack. Very fine, homogenous, surface. Dressing the stone for the first time exposed an inclusion approx. 3 x 2 mm that had previously been hidden by the quarry stamp. The inclusion is harder than the rest of the stone and should removed before sharpening or steered clear off when sharpening. Distance from long edge 35 mm, from side edge 12 mm. Easy to see in the enlarged view, in the picture above left.
Colour: greyish.
Code 315706CartPrice € 475.00
Atago natural honing stone code 315773 Atago natural honing stone Grit size (estimated): approx. 6000
Size 82 mm x 218 mm x 60 mm
Weight 2606 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: veins with lighter shade, chipped edges max. 4 mm deep, surface fine and mostly homogenous.
Colour: grey olive
Code 315773CartPrice € 319.00
Atago natural honing stone code 315670 Atago natural honing stone Grit size (estimated): approx. 6000
Size 82 mm x 220 mm x 76 mm
Weight 3434 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: large and heavy stone, 4 cm long brown stripe near the labels with small slots, under the label 1 cm stripe with slot, close to the edge. Whole surface covered with small spots less 1 mm, appear in white (visible on enlargement). Surface fine and mostly homogenous.
Colour: grey olive, a bit more light than on the picture.
Code 315670CartPrice € 339.00
Atago natural honing stone code 315671 Atago natural honing stone Grit size (estimated): approx. 6000
Size 80 mm x 220 mm x 67 mm
Weight 2829 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: several edges chipped off. Under the label 2 cm lond and 1 mm wide brown stripe with slots. Surface fine and homogenous.
Colour: grey olive
Code 315671CartPrice € 349.00
Atago natural honing stone code 315672 Atago natural honing stone Grit size (estimated): approx. 6000
Size 82 mm x 219 mm x 60 mm
Weight 2575 g
Rear view - Rear view (turned)
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: All 4 corners chipped off. Vein with lighter shade 15 mm wide over the whole length of the stone. One underside chamfered. Scratches on the surface which do not affect the function of the stone. Surface fine and mostly homogenous.
Colour: grey olive
Code 315672CartPrice € 329.00
Atago natural honing stone code 315673 Atago natural honing stone Grit size (estimated): approx. 6000
Size 82 mm x 222 mm x 58 mm
Weight 2566 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: Chipped corner 35 x 20 mm. Edges chipped off max. 6 mm deep. Surface fine and homogenous.
Colour: grey olive
Code 315673CartPrice € 329.00
Ohira high class type 30 natural honing stone code 315774 Ohira high class type 30 natural honing stone Grit size (estimated): approx. 6000
Size 80 mm x 205 mm x 35 mm
Weight 1485 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 30 indicates a natural stone with approximate size 205 x 75 mm. Right front corner 330 x 8 mm and left front corner 8 x 6 mm are missing, some edges chipped off max 9 mm deep. Surface fine and homogenous.
Colour: greyish
Code 315774CartPrice € 379.00
Ohira high class type 30 natural honing stone code 315674 Ohira high class type 30 natural honing stone Grit size (estimated): approx. 6000
Size 75 mm x 208 mm x 46 mm
Weight 1480 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 30 indicates a natural stone with approximate size 205 x 75 mm. One edge on the right 13 x 8 mm is missing, brown embedded particles on the right 20 mm long. Beyond that very clean edges. Surface fine and homogenous.
Colour: greyish
Code 315674CartPrice € 379.00
Ohira high class type 30 natural honing stone code 315675 Ohira high class type 30 natural honing stone Grit size (estimated): approx. 6000
Size 75 mm x 208 mm x 30 mm
Weight 1378 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 30 indicates a natural stone with approximate size 205 x 75 mm. 3 slightly chipped off corners. Beyond that very clean edges. Surface fine and homogenous.
Colour: greyish
Code 315675CartPrice € 379.00
Ohira high class type 30 natural honing stone code 315676 Ohira high class type 30 natural honing stone Grit size (estimated): approx. 6000
Size 77 mm x 205 mm x 43 mm
Weight 1760 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 30 indicates a natural stone with approximate size 205 x 75 mm. Missing corner front right 10 x 4 mm. Beyond that very clean edges. Surface fine and homogenous.
Colour: greyish, olive
Code 315676CartPrice € 399.00
Ohira high class type 30 natural honing stone code 315677 Ohira high class type 30 natural honing stone Grit size (estimated): approx. 6000
Size 75 mm x 200 mm x 40 mm
Weight 1476 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 30 indicates a natural stone with approximate size 205 x 75 mm. All 4 corners chiiped off. Beyond that very clean edges. Surface fine and homogenous.
Colour: grey
Code 315677CartPrice € 399.00
Ohira high class type 40 natural honing stone code 315775 Ohira high class type 40 natural honing stone Grit size (estimated): approx. 6000
Size 75 mm x 208 mm x 30 mm
Weight 1378 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 40 indicates a natural stone with approximate size 205 x 75 mm and larger chipped off corners. Front rdight corner 30 x 20 mm completely missing. Right rear corner chipped off 10 x 8 mm. Light yellowish embedded particles near the middle stamp and between two stamps. Surface fine and homogenous.
Colour: greyish
Code 315775CartPrice € 299.00
Ohira high class type 40 natural honing stone code 315678 Ohira high class type 40 natural honing stone Grit size (estimated): approx. 6000
Size 78 mm x 205 mm x 30 mm
Weight 1240 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 40 indicates a natural stone with approximate size 205 x 75 mm and larger chipped off corners. Rear right corner 30 x 25 mm is completely missing. Rear left corner 20 x 15 mm missing too. Very fine and homogenous stone, surfaced slightly dappled.
Colour: greyish-yellowish
Code 315678CartPrice € 299.00
Ohira high class type 40 natural honing stone code 315679 Ohira high class type 40 natural honing stone Grit size (estimated): approx. 6000
Size 76 mm x 206 mm x 39 mm
Weight 1550 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 40 indicates a natural stone with approximate size 205 x 75 mm and larger chipped off corners. Chipped off corner 20 x 7 mm at the top and at the bottom 15 x 18 mm. Brownish embeded particles at the middle stamp and small hair cracks on the left 15 mm long. Part of the base chipped off. Surface fine and homogenous.
Colour: greyish
Code 315679CartPrice € 309.00
Ohira high class type 40 natural honing stone code 315680 Ohira high class type 40 natural honing stone Grit size (estimated): approx. 6000
Size 74 mm x 205 mm x 33 mm
Weight 1237 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 40 indicates a natural stone with approximate size 205 x 75 mm and larger chipped off corners. Missing corner rear right 10 x 10 mm and chjipped off corner front left 30 x 14 mm. Surface fine and homogenous.
Colour: grey
Code 315680CartPrice € 319.00
Ohira high class type 40 natural honing stone code 315689 Ohira high class type 40 natural honing stone Grit size (estimated): approx. 6000
Size 78 mm x 203 mm x 37 mm
Weight 1361 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 40 indicates a natural stone with approximate size 205 x 75 mm and larger chipped off corners. Missing corner front right 50 x 25 mm and rear left 28 x 12 mm. Reddish and yellowish veins. Surface fine and homogenous.
Colour: greyish, yellowish, reddish
Code 315689CartPrice € 299.00
Ozuku type 30 natural honing stone code 315776 Ozuku type 30 natural honing stone Grit size (estimated): approx. 6000
Size 75 mm x 205 mm x 33 mm
Weight 1396 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 30 indicates a natural stone with approximate size 205 x 75 mm. A nearly perfect stone with slightly dappled surface. Surface very fine and homogenous.
Colour: greyish
Code 315776CartPrice € 599.00
Ozuku type 30 natural honing stone code 315681 Ozuku type 30 natural honing stone Grit size (estimated): approx. 6000
Size 78 mm x 205 mm x 32 mm
Weight 1339 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 30 indicates a natural stone with approximate size 205 x 75 mm. Chipped off corner rear right 22 x 8 mm, front left 9 x 5 mm, rear left 3 x 3 mm. A thin vein crosses the entire length of the stone (visible only when you enlarge the picture) which does not affect the function of the stone. Surface dappled and very fine and homogenous.
Colour: greyish, yellowish
Code 315681CartPrice € 569.00
Ozuku type 30 natural honing stone code 315682 Ozuku type 30 natural honing stone Grit size (estimated): approx. 6000
Size 76 mm x 203 mm x 36 mm
Weight 1483 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 30 indicates a natural stone with approximate size 205 x 75 mm. Chipped off front left 15 x 13 mm, 2 hairline cracks crossing the stone. Surfaced slightly dappled and very fine and homogenous.
Colour: grey
Code 315682CartPrice € 579.00

Will be translated soon!
Ozuku type 30 natural honing stone code 315683 Ozuku type 30 natural honing stone Grit size (estimated): approx. 6000
Size 78 mm x 210 mm x 33 mm
Weight 1460 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 30 indicates a natural stone with approximate size 205 x 75 mm. Eine Abplatzung 25 x 20 mm vorne rechte Ecke , eine an der Kante vorne 10 x 4 mm und eine an der hinteren rechten Ecke 6 x 5 mm. Im Bereich des hinteren rechten Stempfels 2 feine Risse, nicht fühlbar. Ansonsten leicht wolkige Oberfläche mit homogener Struktur.
Colour: greyish, yellowish
Code 315683CartPrice € 559.00
Ozuku type 30 natural honing stone code 315684 Ozuku type 30 natural honing stone Grit size (estimated): approx. 6000
Size 78 mm x 210 mm x 33 mm
Weight 1460 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 30 indicates a natural stone with approximate size 205 x 75 mm. Eine Abplatzung 12 x 10 mm vorne linke Ecke , eine an der Kante vorne 4 x 4 mm. Diagonaler Riss, nicht fühlbar von Kante zu Kante (in der Vergrößerung gut zu sehen).Leicht wolkige Oberfläche mit homogener Struktur.
Colour: greyish
Code 315684CartPrice € 559.00
Ozuku type 40 natural honing stone code 315777 Ozuku type 40 natural honing stone Grit size (estimated): approx. 6000
Size 76 mm x 212 mm x 30 mm
Weight 1304 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 40 indicates a natural stone with approximate size 205 x 75 mm and larger chipped off corners. Fehlende Ecke hinten rechts 30 x 8 mm. An der Vorderkante eine Abplatzung 5 x 5 mm und vorne rechts 4 x 4 mm. Ansonsten besonders homogene Oberfläche.
Colour: light grey
Code 315777CartPrice € 529.00
Ozuku type 40 natural honing stone code 315685 Ozuku type 40 natural honing stone Grit size (estimated): approx. 6000
Size 77 mm x 210 mm x 29 mm
Weight 1253 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 40 indicates a natural stone with approximate size 205 x 75 mm and larger chipped off corners. Fehlende Ecke hinten rechts 6 x 6 mm sich nach unten noch vergrößernd was jedoch keine Auswirkung auf die Schleiffläche hat. An der Ecke vorne links eine Abplatzung 10 x 10 mm. Ansonsten besonders homogene, nahezu perfekte Oberfläche.
Colour: greyish
Code 315685CartPrice € 489.00
Ozuku type 40 natural honing stone code 315686 Ozuku type 40 natural honing stone Grit size (estimated): approx. 6000
Size 77 mm x 207 mm x 35 mm
Weight 1434 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 40 indicates a natural stone with approximate size 205 x 75 mm and larger chipped off corners. Abplatzungen an 3 Ecken 14 x 11 mm, 20 x 7 mm, 5 x 4 mm . Unten fehlt eine Längskante, auf dem Rückseitenbild zu sehen. Ansonsten wolkige Oberfläche mit homogener Struktur.
Colour: greyish, yellowish
Code 315686CartPrice € 449.00
Ozuku type 40 natural honing stone code 315687 Ozuku type 40 natural honing stone Grit size (estimated): approx. 6000
Size 77 mm x 207 mm x 35 mm
Weight 1434 g
Rear view
Rear view (turned)
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 40 indicates a natural stone with approximate size 205 x 75 mm and larger chipped off corners. Fehlende Ecken 25 x 20 mm, 5 x 5 mm sich nach unten verbreiternd, 4 x 4 mm . Unten fehlt eine Längskante, auf dem Rückseitenbild zu sehen. Ansonsten sehr homogene Oberfläche, nahezu perfekt.
Colour: light grey
Code 315687CartPrice € 479.00
Ozuku type 40 natural honing stone code 315688 Ozuku type 40 natural honing stone Grit size (estimated): approx. 6000
Size 77 mm x 205 mm x 32 mm
Weight 1305 g
Rear view
Note: every stone is different! The stone for sale here is the one in the photo.
Characteristics: type 40 indicates a natural stone with approximate size 205 x 75 mm and larger chipped off corners. Dieser Stein ist nur wegen seiner Unterseite in die Kategorie Type 4 gekommen, siehe unten rechts, da fehlt eine Ecke. Oberseitig nur geringe Abplatzungen an einer Ecke und einer Kante 6 x 6 mm. Im Bereich des linken Stempels kleinere braune Risse. Ansonsten ganz zart wolkig mit sehr homogener Oberfläche.
Colour: greyish
Code 315688CartPrice € 469.00

Japanese natural water stones no longer available!
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