Knife Sharpening Stones: Types, Grits, and How to Choose the Right One
A knife sharpening stone is a flat abrasive block that grinds away dull metal and reshapes your blade's edge. You hold the knife at a fixed angle and draw it across the stone's surface until you've built a new, sharp edge from scratch.
The main decision when buying a sharpening stone comes down to three things: what type of stone (water, oil, or diamond), what grit (how coarse or fine the surface is), and whether you need one stone or multiple. For most people sharpening kitchen knives at home, a dual-sided water stone with 1000 and 6000 grit handles everything.
This guide covers all the types, explains what grit numbers actually mean, and helps you pick the right stone for your knives and skill level.
What types of knife sharpening stone are there?
Sharpening stones fall into four main categories. Each works differently, wears differently, and suits different people.
Water stones (whetstones)
Water stones are the standard for kitchen knife sharpening. You soak them in water before use, and the water acts as a lubricant while you sharpen. As you work, the stone's surface breaks down and creates a slurry of loose abrasive particles. That slurry actually speeds up the sharpening process.
Most water stones today are synthetic (made from aluminium oxide or silicon carbide bonded with resin), which means consistent grit and predictable performance. They cut fast, come in a huge range of grits from 200 to 12,000+, and produce excellent edges on kitchen knives.
The catch is maintenance. Water stones are softer than other types, so they wear down and dish out (develop a hollow in the middle) over time. You need to flatten them periodically with a flattening stone or sandpaper on a flat surface.
Water stones are the best choice for Japanese knives. The softer abrasive matches well with harder Japanese steels like AUS-10 (HRC 58-60), where you want a fine, controlled edge without risking chips.
Oil stones
Oil stones use a thin layer of honing oil as lubricant instead of water. They're the traditional Western sharpening stone, and they've been around for decades.
The main advantage of oil stones is durability. They're much harder than water stones, so they hold their flat surface far longer and rarely need flattening. They also come in natural varieties (Arkansas stones) that produce a distinctive polished edge.
The downside is speed. Oil stones cut more slowly than water stones, and they don't come in grits as fine. For kitchen knives, especially Japanese ones with harder steel, water stones give you more control and a better result. Oil stones work fine for Western knives and general-purpose tools, but they're not the first choice for kitchen work anymore.
Diamond stones
Diamond stones have a metal plate coated with industrial diamond particles. They're the fastest-cutting stones available and never need flattening because the metal base stays perfectly flat.
They work well for two things: flattening your other stones, and quickly grinding away material on very dull or damaged blades. Some people use them as their primary sharpening stone, but the aggressive cut can be harder to control, and cheaper diamond plates wear unevenly as the diamond coating thins out.
Higher-quality diamond stones (like those from DMT or Atoma) last longer and cut more consistently, but they cost significantly more than a good water stone. They also don't produce the same polished finish that fine-grit water stones achieve.
Ceramic stones
Ceramic stones are extremely hard and fine-grained. They don't need any lubricant (though a splash of water helps clear metal particles) and they barely wear at all.
They're best used as finishing stones. A ceramic stone won't remove enough material to reshape a dull edge, but it refines and polishes an edge that's already been sharpened on a coarser stone well. Some knife makers include a small ceramic rod with their knives for touch-up maintenance between full sharpenings.
What do sharpening stone grit numbers mean?
Grit measures how coarse or fine the stone's surface is. Lower numbers mean larger abrasive particles that remove metal quickly. Higher numbers mean smaller particles that remove less metal but leave a smoother, more polished edge.
Think of it like sandpaper. You wouldn't sand furniture with 2000-grit paper (you'd be there all day), and you wouldn't finish it with 80-grit (you'd scratch it up). Same principle applies to knife sharpening.
| Grit range | Category | What it does | When to use it |
|---|---|---|---|
| 200-400 | Coarse | Removes metal fast, reshapes edges | Chipped or badly damaged blades |
| 800-1000 | Medium | Sharpens dull knives, sets a new edge | Regular sharpening (your workhorse grit) |
| 2000-3000 | Fine | Refines and smooths the edge | After medium grit, before polishing |
| 4000-6000 | Very fine | Polishes the edge, removes scratches | Finishing Japanese knives |
| 8000-12000 | Ultra fine | Mirror polish, razor-sharp refinement | Single-bevel knives, professional finishing |
For kitchen knives, the grit range that matters most is 1000-6000. Anything below 1000 is for repairs, anything above 6000 is for specialists.
What grit sharpening stone do you need?
This depends on your knives and how often you sharpen them.
If you sharpen regularly (every few weeks), a 1000-grit stone handles 90% of the work. Your knife never gets dull enough to need anything coarser. Follow it with a 4000-6000 grit stone to polish the edge, and you're done.
If you let your knives go months between sharpenings, you might occasionally want a coarser stone (400-600 grit) to reset a really dull edge before moving to 1000 grit. But for most home cooks, starting at 1000 is fine even for neglected knives.
The best starting setup
A dual-sided stone with 1000 grit on one side and 6000 grit on the other is the most practical setup for home use. One stone, two grits, no decision fatigue. The Yuzu dual-sided whetstone uses this exact combination. The 1000 side sharpens, the 6000 side polishes, and together they bring any kitchen knife from dull to sharp in 10-15 minutes.
Once you're comfortable with the basics, you can add a coarse stone (400 grit) for repairs and a mid-range stone (3000 grit) for a more gradual progression. But don't start there. Learn on two grits first.
How to choose a sharpening stone for your knives
The stone that works best depends on the steel in your knives.
Japanese knives (harder steel)
Japanese kitchen knives use harder steel (typically HRC 58-65). This means the edge is thinner, the sharpening angle is lower (usually 10-15 degrees per side), and the blade responds well to fine-grit water stones. A 1000/6000 water stone is the standard recommendation.
Avoid pulling Japanese knives across coarse diamond plates unless you're fixing actual damage. The aggressive cut can remove too much material from a thin, hard blade.
Western knives (softer steel)
Western kitchen knives use softer steel (HRC 54-58). They can handle more aggressive sharpening and don't strictly need the polishing step. A 1000-grit water stone alone will get a Western knife sharp enough for kitchen work. Adding a 3000-6000 finishing stone is a bonus but not essential.
Oil stones and diamond stones also work well with Western knives, since the softer steel is more forgiving.
Mixed knife collections
If you own both Japanese and Western knives, go with a dual-sided water stone. It works well with both steel types. Just adjust your angle: 15 degrees for Japanese knives, 20 degrees for Western ones. Our whetstone sharpening guide walks through the full process step by step.
How to care for your sharpening stone
A well-maintained stone lasts years. A neglected one becomes uneven and produces inconsistent edges.
Before use: soak properly
Water stones need 15-30 minutes of soaking before use. Submerge the stone in water until air bubbles stop rising. A stone that isn't fully saturated will grab at the blade and make sharpening harder than it needs to be.
After use: rinse and dry
Rinse the stone under running water to clear the metal slurry. Let it air dry completely before storing. Storing a damp stone in a closed container can encourage mould growth, especially on softer water stones.
Flatten regularly
Every few sharpening sessions, check your stone's surface. Place it on a flat surface and look for a dip or hollow in the centre. If it's dished out, you need to flatten it.
The easiest way is to rub the stone against a flattening plate (a coarse diamond plate works well) with water until the surface is uniformly flat. You can also use wet/dry sandpaper (200-400 grit) taped to a piece of flat glass or granite. A flat stone is more important than a fine stone.
Sharpening stone vs honing rod: what's the difference?
A honing rod (or honing steel) doesn't sharpen. It straightens the edge. Over time, a knife's thin edge bends and folds microscopically, which makes it feel dull even though the edge itself hasn't worn away. A few passes on a honing rod realign that folded edge and the knife feels sharp again.
A sharpening stone actually removes metal and grinds a new edge. It fixes genuinely dull or damaged blades that a honing rod can't help.
Use a honing rod between sharpenings (every few uses) and a sharpening stone when the rod stops making a difference (typically every few weeks to months, depending on use). The two aren't interchangeable. They do different jobs.
One note: ceramic honing rods do remove a small amount of metal, so they sit somewhere between a traditional steel rod and a sharpening stone. They're fine for light maintenance but won't replace proper stone sharpening. Our knife sharpening guide compares all four methods side by side.
Get started
You don't need an expensive setup or five different stones. A single dual-sided whetstone covers regular sharpening and polishing in one stone. Pair it with a good knife worth maintaining, and learn the basics. The whetstone guide and angle guide linked above cover everything from soaking to finishing.
Sharpening your own knives costs less than professional services, and once you get the hang of it, the results are better too. A sharp knife changes how cooking feels.
