Naniwa Diamond Whetstone

$259 AUD

Only 2 left in stock!

Naniwa diamond whetstones are incredibly hard, flat sharpening stones that use water as a cutting medium. Consisting of a 2mm-thick layer of diamond abrasive particles bonded to an flat, anodised aluminium plate, Naniwa diamond stones are incredibly hard, versatile and long-lasting.

Because these stones use diamond cutters to abrade your blade of choice, they can be used to sharpen harder materials than water stones are capable of. As well as high carbon steel, high speed steel and alloyed tool steels, they can cut glass, ceramic and even carbide. This means that sharpening ceramic knives, carbide cutters, chamfering glass plates and getting an edge on even the hardest modern blades is achievable with Naniwa stones.

The incredible hardness of their diamond abrasives also makes these stones fantastically hard-wearing. Whereas water stones require regular flattening, Naniwa stones maintain their flatness thanks to the extremely durable diamond compound and stable aluminium substrate. If heavy use does wear the plate slightly out of flat, we have redressed these stones with light passes of our adhesive backed sandpaper on a glass plate. Due to the hardness of these plates, however, we did use six strips (two sheets) of sandpaper to achieve the desired result. This process is rarely required, and we expect the 2mm layer of diamond abrasive to last a lifetime.

We offer the Naniwa stones in #600, #1000, #3000 and #6000 grits for a range of applications. The #600 and #1000 grits make excellent substitutes for water stones of similar grades, where the bulk of preparatory grinding and sharpening work takes place. The lower maintenance Naniwa stones speed up the sharpening process, especially when lots of blades are involved, or when particularly heavy work needs to be done to remove chips from a blade.

The #3000 and #6000 stones are excellent for edge finishing, as well as quick tune-up jobs. Professional chefs in busy kitchens appreciate being able to re-hone a knife with just a spray of water and without having to flatten or soak a stone. Woodworkers also enjoy the speed benefits of such a low maintenance stone, and can achieve a mirror finish in minimal time even on the hardest of blades.

Each Naniwa stone comes with a small nagura stone, which useful for re-dressing the surface after metal build up.

Prior to use, it is advisable to spray each stone with water or soak for a minute or two.

All stones are dimensioned 210mm x 75mm x 16mm.

At JTA we are proud of our order turnaround times and work hard to ensure the best possible service. Our shipping policy has been developed to provide a fast, safe and environmentally sustainable shopping experience for all of our customers.

We are NOT a drop-shipping company and hold all of our stock in Sydney. We dispatch every weekday, and we are usually able to dispatch orders received before 1.30pm on the same day. If you urgently require your purchase to be dispatched on the day you order it we suggest that you call us or be sure to select express shipping at checkout to ensure we prioritise your parcel.

Shipping Charges:

We have revised our logistics systems to offer the best possible postage price to our customers. All prices are in $AUD. Dispatch within 24hrs of purchase.

Within Australia:

Regular Post: $8.00, tracking number emailed to you at dispatch

Express Post: $14.50, tracking number emailed to you at dispatch

Some thin and light items are able to be shipped at a letter rate of $3 (replacement saw blades, small rulers, abrasives and non slip mats, for example). Please note that letter rates are regular post only (no express) and are not available with tracking.

Within New Zealand:

We are now able to offer our New Zealand customers $15 flat-rate shipping on orders under 2kg.  For orders heavier than 2kg the following rates apply:

<2kg: $15

3kg: $24

4kg: $28

5kg: $32

Prices to Canada and US:


Express Courier International:

Estimated Delivery Time - 3-5 Business Days (to metro areas of major cities)

Flat Rate - AU$30 on orders up to 2kg (4.4lbs)

For orders over this weight:

<3kg: $56

<4kg: $63.40

<5kg: $70.75

For orders over 5kg in weight, please email us at

Prices for all other international orders are calculated at checkout according to Australia Post’s standard rates.

Delivery Times:

From the date of dispatch we expect the following delivery times within Australia:

Regular Post: Within 3-5 business days (metro areas) or 4-8 busines days (remote areas)

Express Post: 1-2 business days (metro areas) or 3-6 business days (remote areas)

Plastic-free Policy:

Japanese Tools Australia is an environmentally conscious company and we endeavour to eliminate plastics in as many parts of our business as possible. Your purchase will be shipped in recycleable non-plastic materials, and we re-use cardboard and paper wherever possible in our shipping process.

Exceptions to plastic-free policy:

Unfortunately, we are required to dispatch some express items in pre-paid satchels and in such circumstances we have no choice but to use a plastic satchel. Please keep in mind these satchels are 100% recyclable. Our suppliers also use plastic in their packaging of some products, and we do not remove these protective measures before shipping. We are considering strategies to eliminate these two remaining sources of plastic in our shipping process. As many of our items are hand-made, they do not arrive to us or to you with extraneous packaging, though this is not the case for all of our products.

Breakage in shipping policy:

We pack our shipments in specialised materials to ensure that our customers find them in the same condition that we send them. If you receive your products in a damaged condition, please email with your order number and photos of the condition of the products within a week of collection. If an item is deemed to have been damaged in transit we will replace it with like kind at no extra shipping cost to the customer.

If you are unhappy with the condition of your product and it has not been damaged in transit, please refer to our returns and exchanges policy. 

We stand behind the quality of our tools. If a tool is found to be faulty or damaged in transit, we will verify the issue with you, and offer a refund or exchange when the problem is brought to our attention within 30 days from purchase. If problems arise outside of this period this policy will apply at our discretion. Where a refund or exchange is agreed upon, we will mail you a paid addressed bag to return your items, verify their condition once we receive them, and then process a refund or mail the new item.

If a tool is purchased as a present or the purchaser changes their mind, we will exchange for stock of equal value or store credit when we are contacted within 2 weeks of the purchase. We ask that the customer covers the cost of shipping in these instances. We will take a payment for shipping over the phone, send you a paid addressed envelope, verify the goods' condition once we receive them, and then mail the new item.

If a tool is damaged through improper use, we encourage you to contact us. We may not be able to exchange the tool, but may be able to offer advice on technique or recommend a more appropriate tool. Where possible, we encourage our cutomers to ask us questions about our tools' use before they purchase them. We can be contacted at or 02 9527 3870.

Sorry, we can't exchange gift cards.

Want to try this product out on some beautiful Huon Pine? Come in to the JTA Showroom / Workshop in Kogarah Sydney and let our expert team show you the beauty of Japanese tools.

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Customer Reviews

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Trevor M.

Diamond honing stone

Very good quality

Philip C.

Naniwa Diamond Whetstone 6000

This stone is a high level professional stone that creates a beautiful finely polished tool or blade surface. It is nicely complemented by the intermediate 3000 stone. The stone are a generous size and extremely flat which I feel will last me a lifetime. A great investment.

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