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How to Sharpen Ceramic Knives | Crystal's Cookware Hub

How to Sharpen Ceramic Knives


Ceramic knives are the sharpest knives for the kitchen, and they stay sharper for longer than steel knives. But what do you do when they chip, or eventually dull? No one wants a chipped or dull knife because it is not helpful in the kitchen and can be dangerous. So, how do you sharpen ceramic knives?

I explain how and compare some of the best knife sharpeners for the job.

In a hurry?  Click to see my pick of the best knife sharpener for the money here.

Can ceramic knives be sharpened?

Having sharp knives gives you the best performance when slicing and preparing fine foods

How to Sharpen Ceramic Knives

People often ask: can you sharpen ceramic knives? Well, you certainly can! But don’t use that old sharpening rod or triangle that you use for your steel knives. It is not recommended, as it may chip the blade and ruin the knife.

So, how do you sharpen a ceramic knife?

I’ve covered the ceramic coating used in cookware such as non stick pans. Its made from silica. Ceramic knives are made from zirconium oxide (zirconia), which has a Moh’s hardness of 8 (diamond is 10). Moh’s hardness is a rough measure of the resistance of a smooth surface to scratching or abrasion.

Manufacturers often recommend sending ceramic knives to professionals for sharpening. Which you can do. Brands like Kyocera even offer free lifetime sharpening (though you may need to pay for transport costs).

However, you can sharpen the knives yourself at home. (Always check the warranty to make sure that you are not voiding it by sharpening the knife yourself.)

You use a similar technique to that practiced on steel knives, but for ceramic knives, it’s essential you use a diamond coated surface, whether it’s a sharpening stone, file, rod or another sharpening system.

How to sharpen ceramic knives using a diamond sharpening stone

Many people prefer sharpening stones over other methods. One of the biggest reasons for this is that the stone will last you a lifetime, and is easy to use on all sorts of tools and utensils — scissors, chisels, and gardening tools — not just knives.

Comparison Table: 5 Ceramic Knife Sharpeners

Here we compare some of the best ceramic knife sharpeners that are easy to use because they are designed with the right angle for sharpening.

ProductImage Manual/ ElectricFeaturesPrice Rating

ALPULON 3-Stage Kitchen Knife Sharpener

 ManualDiamond Rod



Kyocera Advanced Diamond Knife SharpenerBattery poweredDiamond grinding wheelView 4.2
Shenzen Knife Sharpener ElectricDiamond wheel cartridgeView 4.3
Eaaglo 3- stage Knife SharpenerManualDiamondView 4.3
Barbestar 2-stage Knife Sharpener ElectricDiamond Coated Sharpening Wheel SystemView 4.3

The DMT W6EFC Three 6-Inch Diamond Whetstone Model 

This makes a great gift.  It comes complete with a hard timber box for storage, and has three sharpening grades: Blue, ‘coarse’ (325 grit), for quick removal of the dull edge, Red, ‘fine’ (600 grit), for honing that razor sharp edge, and an Green, ‘extra-fine’ (1200 grit), for polishing and refining an edge.

The brand, DMT, is unique in that it uses micronized monocrystalline diamonds that are precisely sized for a greater uniformity of the diamond surface. “…micronized monocrystalline diamonds, precisely sized for a more uniform diamond surface. No other diamond sharpeners offers micronized monocrystalline diamond and most offer the lesser grade poly-crystalline diamond”, according to the manufacturer. 

For your ceramic knife, you would use the Red stone and a low angle of less than 20°. Make sure to run your knife from heel to toe.

For sharpening your ceramic knives (and more) …this diamond whetstone set is a keeper and worth the money.

How to sharpen ceramic knives using a diamond file

If you feel you could confidently use a file, then jump below to check out the video on using a diamond file to sharpen ceramic knives.

How to sharpen ceramic knives the cheats way

You can select either a manual or electric knife sharpener that’s designed with the ceramic knife in mind.

An electric ceramic knife sharpener like this one has a 2-stage diamond sharpening wheel, designed for ceramic kitchen knives. Electric sharpeners are fast and simple to use. They can remove the small blade chips.

You might be considering a manual one as the best kitchen knife sharpener for you. These tend to be a bit cheaper and fit most people’s budget like this diamond manual knife sharpener.

Most of these suit other types of kitchen knives as well.

#1. ALPULON 3-Stage Kitchen Knife Sharpener Review

This manual knife sharpener is suitable for ceramic and steel knives. It will sharpen straight-edge, fruit, hunting, pocket, boning, folding and all chef knives including a Satoku.

How? Repeatedly pull the knife blade back in one direction through the sharpening slot. The V-shape design is set at a proper angle to always keep the knife sharp with a good durability.

The sharpening slot for your ceramic knife is marked (the one closest to the handle). You will also know it by its white sharpening pieces and each slot should be labeled as ‘ceramic’, ‘coarse’, or ‘fine’. You take the knife through the slot a few times to sharpen it.

The sharpener head is detachable for easy cleaning and allowing the part to be replaced if ever needed.

It has a diamond rod. The surface is UV electroplated. The base is made of non-slip silicone. It comes with a 1-year warranty.

Click here to see the latest price on the ALPULON Knife Sharpener


#2. Kyocera Advanced Ceramics Knife Sharpener Review

Once again, this is a kitchen ceramic knife sharpener that can be used on steel and ceramic knives. It can be used to sharpen all types of kitchen, household, sporting and pocket knives.

With this item, there is a roller assisted guide to help you to control and aid precision sharpening.

The beauty of this item is that there is no mess, as the grinding dust is contained within the safety cover.

Though some would consider it a convenience (like with outdoor activities), a downside some is that the unit runs on batteries (4 × AA) — not included in the package, loses power over time. Using high-quality rechargeable types can help with the replacement issue.

Click here to see the latest price on the Kyocera Advanced Diamond Knife Sharpener


#3. Barbestar Knife Sharpener Review

What’s good about this 2 stage diamond coated sharpening design is the large handle (and it’s price). It sits flat and sturdy on the bench and has a slot specially designed for ceramic knives (fine grade grinding). The other slot (coarse) can be used for steel knives, including fishing, hunting, and pocket knives.

How? Insert your ceramic knife into the ‘fine’ grade slot and pull the knife through the slot from heel to toe with proper and uniform intensity, repeating this action 3-5 times. Always clean the knife with water and let dry before use.

Possibly the best buy for the price…Probably not suited to your most expensive ceramic knives, however. It is best to spend in line with the expense of your knives and your budget, of course.

Click here to see the latest price on the Barbestar Knife Sharpener


#4. Eaaglo 3-Stage Knife Sharpener Review

Not a bad price for the functionality and professional look…

How? Like the previous ones, this sharpener has a special slot for ceramic knives. The unit is versatile with the 3-stage process able to sharpen your wavy steel knives also, but not recommended for serrated knives or scissors.

How? Insert your ceramic knife in the ‘ceramic’ slot and run it through from heel to toe a couple of times.

This item has a non-slip base. The stylish look of this sharpener means it can be left on the kitchen bench to impress. It has a stainless steel outer design with a black and silver look. No ugly screws or finishes.

Click here to see the latest price on the Eaaglo Knife Sharpener


#5. Shenzhen Knife Sharpener Review

Two slots and two setting on the diamond grinding stone in this unit are ‘coarse’ (600 grit) and ‘fine’ (800 grit). The grinding wheel can grind out small chips of up to 1 mm for improving the use of your ceramic knives.

To use: You can use the two slots to sharpen your ceramic knives. First, gently guide your ceramic knife through the slots of the coarse setting then take it through the fine setting to hone and polish it. Repeat the action of taking your knife through the fine setting for a smooth sharp blade in seconds.

The beauty of this unit is that it can process those chips (up to 1 mm) that appear in your ceramic knife edges.

Click here to see the latest price on the Shenzhen Knife Sharpener


How to Sharpen Ceramic Knife at Home Using a Diamond File:


Safety Tips

It’s best to get yourself a set of cut-resistant gloves when you are working with sharpening knives, especially with using a file, stone, or rod.