How to Sharpen Ceramic Knives

This post was most recently updated on April 6th, 2020

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? Here, I explain how and review some of the best knife sharpeners for the job.

This is Part 2 of my kitchen knife series (Part 1 reviews ceramic knife sets and Part 3 covers how to make up a good kitchen knife set).

In a hurry?  Check out a popular rated buy at Amazon – See details.

Can ceramic knives be sharpened?
Having sharp knives gives you the best performance when slicing and preparing fine foods

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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?

Different to the ceramic coating used in cookware, such as non stick pans, which is made from silica, ceramic knives are made from zirconium oxide (zirconia). Zirconia has a Moh’s hardness of 8 (diamond is 10), which is a is a rough measure of its resistance 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.)

See the techniques below.

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.

Comparison Chart

The following compares knife sharpeners, best for ceramic knives, that are easy to use because they are designed with the right angle for sharpening.



ManualDiamond Rod

See Price


Kyocera Advanced

Battery poweredDiamond grinding wheelSee Price4.2


ElectricDiamond; wheel cartridgeSee Price4.3

ManualDiamondSee Price4.3

Ceramic Sharpeners Reviewed

#1. 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.

Diamond Whetstone — Click image for more details at Amazon

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.


A product that will last and so worth the price.

#2. ALPULON 3-Stage Kitchen Knife Sharpener Review

Cheap manual knife sharpener — Click for price details at Amazon

This manual knife sharpener is for all straight-edge, fruit, hunting, pocket, boning, folding and all chef knives including a Satoku.

How does this work? You need to 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.


Quite cheap.

#3. Kyocera Advanced Ceramics Knife Sharpener Review

Battery operated — Click image for details at Amazon

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.

#4. Shenzhen Knife Sharpener Review

Electric sharpener — Click image for details at Amazon

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.

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.

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 the Shenzhen shown above 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 the Alpulon 3-stage one shown above.

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

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.

Diamond File Demo

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.

Crystal Hodge

Hi, This is Crystal Hodge, a believer in healthy eating starting with the cooking. I'm an outdoor-loving mom and I love helping people make informed choices about healthy cookware. I'm a wholesome living wannabe. All I wanna do is: Live. Love. Cook. Healthily!

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