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Naniwa Diamond Pro Stone, 400 grit

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Naniwa Diamond Pro 400 Grit Japanese Sharpening Stone

These stones feature a 1mm thick resin-bound diamond matrix layer bonded to a metal plate. Over dimensions: 210mm x 75mm x 16mm. Like most diamond stones, these cut fast and wear slowly, but since the layer of diamonds is bound in a matrix and not just deposited in a thin layer on the surface as with Atoma and DMT plates, they should last longer since as you use them they will shed worn surface material, exposing fresh diamond grit.

Diamond stones are great for sharpening knife blades made from very hard "super steels" which resist abrasion by normal water stones.

These are meant to be used wet. They come with a dressing stone to keep the diamond layer clean and working properly. Soak the dressing stone prior to use.

Customer Reviews

Based on 1 review
You need this one.

As a pro freehand knife sharpener, good whetstones are critical and I’ve settled on a few brands that I use daily, 6 days a week. Diamond stones have become very popular over the last decade in Japan and Naniwa has produced its version. I’ve used it on many hand made Japanese knives and it really is awesome. It’s aggressive, it feels like it’s doing what I want it to do, remove fatigued metal efficiently. Don’t worry, it’s not going to be ripping steel away like a grinder that’s out of control. This stone is exactly what I wanted it to be and it very likely will not need flattening. It’s 1mm thick but I guarantee it will last a very long time, longer than my synthetic 400 grit stones. I also sharpen every day so if you sharpen your own knives then you don’t need to worry. For the ultimate set up, follow up with the 1k NP Diamond stone. I’m very impressed and it takes a lot to impress me when it comes to water stones.

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