Sharpening is a vital process for keeping your tools and knives in top condition. Choosing the right sharpening stone can affect the results. Recently, diamond sharpening stones have gained popularity due to their efficiency and durability. But are they better than traditional sharpening stones?
In this article, I will explore the advantages of diamond sharpening stones. I will show how they compare to other types, and offer tips on their maintenance. I will also look at usage to help you make an informed decision.
What Are Diamond Sharpening Stones?

Diamond sharpening stones are made with tiny industrial-grade diamond particles. These particles get embedded in a steel or resin plate. They bond these diamonds to a flat surface, offering a superior sharpening experience. It’s a choice better when compared to traditional whetstones.
The ultra-hard surface of the diamond stone makes it capable of sharpening any metal. Such metals include hard stainless steels and high-carbon blades.
Diamond stones come in various grit sizes. They range from extra coarse (120 grit) to ultra-fine (3000 grit). This variety allows users to progress from aggressive material removal to fine polishing on the same type of stone.
Why Choose Diamond Stones Over Other Types?
Diamond stones stand out for their quick cutting action. You can compare it to natural or synthetic whetstones. Diamond sharpening stones need less time to sharpen a blade. It’s due to their aggressive cutting capability. Additionally, diamond stones maintain their flatness over time. This is unlike other stones that may dish or wear unevenly.
Here’s a comparison table of diamond stones versus other common sharpening stones:
Feature | Diamond Stones | Oil Stones | Water Stones | Ceramic Stones |
---|---|---|---|---|
Cutting Speed | Very Fast | Slow | Moderate | Moderate |
Durability | Excellent | Good | Fair | Good |
Maintenance | Low | Moderate | High | Low |
Versatility | High | Moderate | Moderate | Moderate |
Cost | High | Moderate | Varies | Moderate |
Benefits of Diamond Stones for Knife Sharpening
- Speed and Efficiency: Diamond stones remove material faster than other sharpening stones. It reduces the time needed for sharpening.
- Durability: Diamonds are the hardest natural substance. These stones can last way longer than other types of stones when properly maintained.
- Versatility: They can sharpen a wide range of metals, from the softest to the hardest blades.
- Consistency: Diamond stones provide a consistent sharpening surface throughout their lifespan.
- No Messy Slurry: Unlike traditional waterstones, diamond stones don’t create a messy slurry during use.
- Low Maintenance: They don’t need flattening like waterstones. This will save time and effort in maintenance.
Diamond Stone Break-in Process

Understanding the Initial Coarse Feel
When you first start using a new diamond stone, you may notice a rough and uneven feel. This is normal and part of the break-in process. Here what to expect during the first few uses. Diamond particles will settle into the surface smoothing out and becoming more uniform.
Break-in Protocol for Diamond Stones
To break in a diamond stone, it’s essential to use it with lighter pressure in the start. Slowly increase the pressure as the stone’s surface becomes more refined. This will ensure the stone maintains its longevity and sharpening quality.
Here’s a step-by-step break-in process:
- Start with a scrap piece of soft metal or an old knife you don’t mind scratching.
- Use very light pressure and make about 20-30 passes on each side of the stone.
- Clean the stone and repeat the process with a little more pressure.
- Continue this process a few times, lightly increasing pressure.
- After about 100-150 passes total, your stone should be broken in.
Expected Lifespan After Break-in
After the break-in period, a diamond stone can last for many years. Their longevity depends on how often you use them and how well you maintain them. On average, a properly cared-for diamond stone can last over a decade. Especially if used for lighter, maintenance sharpening tasks rather than heavy material removal.
Factors affecting the lifespan of diamond stones:
- Frequency of use
- Types of metals being sharpened
- Proper cleaning and storage
- Quality of the diamond stone
How to Use Diamond Stones
Should You Use Water on Diamond Stones?
While diamond stones can be used dry. Using a lubricant such as water or oil can help prevent metal filings from clogging the surface. Most manufacturers recommend using water to flush away swarf (sharpening debris). This ensures that the stone remains clean and effective.
Benefits of using water:
- Reduces friction
- Prevents clogging
- Helps maintain a clean surface
- Extends the life of the stone
Water and Corrosion Risks
Diamond stones, especially those bonded to steel plates, can be prone to corrosion. This will occur if left wet for too long. After each use, it’s crucial to dry the stone completely. Doing this will prevent rust and other forms of corrosion from setting in.
Tips to prevent corrosion:
- Dry the stone immediately after use
- Store in a dry place
- Consider using a rust inhibitor spray for long-term storage
Alternative Lubricants for Diamond Stones
Some users prefer to use other lubricants like honing oil or window cleaner to aid in sharpening. These lubricants reduce friction, making the sharpening process smoother. It also protects the stone’s surface from buildup.
Popular alternative lubricants:
- Honing oil
- Window cleaner
- Specialized diamond stone lubricants
- Soapy water
Here is a video explaining how to use a diamond sharpening stone.
Cleaning and Maintaining Diamond Stones
Dry Cleaning Techniques: Paper Towel and Rubber Eraser
To clean a diamond stone after use, a simple paper towel can remove the majority of the swarf. If you face more stubborn debris. Using a rubber eraser can help lift metal filings from the stone’s surface. Note it does this without damaging the diamonds.
Step-by-step dry cleaning process:
- Wipe the surface with a clean, dry paper towel
- Use a rubber eraser to gently rub areas with stubborn debris
- Wipe again with a paper towel to remove any eraser residue
Avoiding Stone Clogging
Over time, metal buildup can clog a diamond stone, reducing its effectiveness. Regular cleaning with water or a cleaning agent will help avoid this issue. This simple step ensures a long lifespan for the stone.
Prevention tips:
- Clean after every use
- Use adequate lubricant during sharpening
- Avoid sharpening very dirty or rusty blades
How to Handle Buildup on the Surface
There are time when your diamond stone becomes heavily clogged. Using a brush with soap and warm water can help restore its cutting power. For a deep cleaning of your diamond stone. A specialized diamond stone cleaner or rust remover can help end metal deposits.
Deep cleaning process:
- Soak the stone in warm, soapy water for 10-15 minutes
- Scrub gently with a soft-bristled brush
- Rinse completely with clean water
- For stubborn buildup, use a specialized cleaner following the manufacturer’s instructions
- Dry completely before storage
Preventing and Managing Grit Contamination

What Is Grit Contamination?
Grit contamination occurs when sharpening debris mixes with other particles on the stone. This will affect the sharpening process and perhaps damage the blade.
Effects of Grit Contamination on Sharpening Quality
Contaminated grit can cause uneven sharpening. It may even lead to scratches or other defects on your blade. This is why maintaining a clean sharpening surface is crucial for high-quality results.
Potential issues from grit contamination:
- Inconsistent edge
- Scratches on the blade
- Reduced sharpening efficiency
- Premature wear of the stone
How to Minimize Grit Contamination During Use
To prevent grit contamination, regularly rinse your stone while sharpening. Keep the sharpening area clean. Avoid cross-contaminating grits from different sharpening stones or surfaces.
Best practices:
- Use separate stones for different grit levels
- Clean the stone and blade between grit changes
- Keep your sharpening area tidy
- Use a dedicated sharpening station if possible
Sharpness Testing and Evaluation
Paper Test for Sharpness
One common method to test the sharpness of a blade after using a diamond stone is the paper test. Simply slicing through a sheet of paper will reveal any rough spots on the blade. This test will allow you to gauge its sharpness.
How to perform a paper test:
- Hold a sheet of paper vertically
- Gently press the blade against the top edge of the paper
- Draw the blade downwards
- A sharp knife should cleanly slice through the paper with minimal pressure
Using BESS Testers for Quantitative Results
The BESS (Brubacher Edge Sharpness Scale) test. It is a more scientific way of evaluating sharpness. This method uses a tester to measure the force needed to cut through a standardized medium. This tester offers precise feedback on your blade’s sharpness.
BESS scale interpretation:
- 50-100: Extremely sharp (razor blade level)
- 100-200: Very sharp (excellent for most cutting tasks)
- 200-300: Sharp (suitable for general use)
- 300-400: Moderately sharp (needs attention)
- 400+: Dull (requires immediate sharpening)
Other Methods to Assess Blade Sharpness
Other sharpness evaluation techniques include the hair shaving test. In this test you run the blade along your arm to see if it easily shaves hair. Another popular one would be the thumbnail test. This one checks how well the edge grips a fingernail without slipping.
More sharpness tests:
- Tomato test: A sharp knife should easily slice through a tomato’s skin
- Grape test: The knife should cleanly cut through a grape’s skin without pressure
- Newspaper slicing: A sharp blade should make clean, easy cuts through newspaper
Common Problems with Diamond Stones

Rust and Corrosion: Causes and Prevention
Rust can occur on steel-bonded diamond stones if they are not dried properly after use. To prevent this, always dry your stone thoroughly and store it in a dry environment.
Prevention tips:
- Use a hairdryer on low heat to ensure complete dryness
- Store with silica gel packets to absorb moisture
- Apply a thin layer of mineral oil for long-term storage
When to Replace Diamond Stones
Diamond stones can last many years. But over time the diamonds will wear down, reducing their sharpening capability. When you notice that your stone no longer provides a quick and effective sharpening. This is a sign it may be time to replace it.
Signs it’s time to replace your diamond stone:
- Significantly longer sharpening times
- Uneven surface
- Visible bare spots where diamonds have worn away
- Inability to achieve desired sharpness
Lifespan of Different Grit Levels (Coarse vs. Fine Stones)
Coarse diamond stones on average wear out faster than finer stones. This is due to their aggressive nature. But, with proper care, both can last for several years.
Estimated lifespan by grit:
- Coarse (120-400 grit): 3-5 years with regular use
- Medium (600-1000 grit): 5-7 years
- Fine (1200-3000 grit): 7-10 years or more
Best Diamond Sharpening Stones Available
Top Premium Option: Atoma Diamond Stones
Atoma diamond stones are considered the gold standard among professionals. It’s due to their high-quality construction, consistent grit, and durability.
Key features of Atoma stones:
- Mono-crystalline diamonds for long-lasting performance
- Unique dot pattern for efficient swarf removal
- Available in various grits from 140 to 8000
- Thin profile for easy handling
Best Value Option: Sharp Ball Stones
For those seeking a more affordable option without sacrificing quality. Sharp Ball diamond stones provide excellent value and performance.
Sharp Ball stone highlights:
- Double-sided design for many grits in one stone
- Non-slip base for safe use
- Available in combination grits (e.g., 400/1000)
- Suitable for both beginners and experienced users
Key Features to Look for When Choosing a Diamond Stone
When selecting a diamond stone, consider the grit and the bonding material. Another concern is whether the stone comes with a non-slip base or a case for easy storage.
Important factors to consider:
- Grit range suitable for your needs
- Quality of diamond particles (mono-crystalline vs. poly-crystalline)
- Base material (steel vs. resin)
- Size and portability
- Warranty and manufacturer reputation
Frequently Asked Questions About Diamond Stones
How Long Do Diamond Stones Last?
With proper care, diamond stones can last over a decade. Depending on the frequency of use and the materials being sharpened.
Factors affecting longevity:
- Quality of the stone
- Frequency of use
- Types of materials sharpened
- Proper maintenance and storage
What’s the Best Maintenance Routine?
Regular cleaning after each use and ensuring the stone is dry before storage. These are essential for maintaining its longevity.
Recommended maintenance routine:
- Clean after every use with water and mild soap
- Dry completely with a clean cloth or paper towel
- Store in a dry place, preferably in a protective case
- Periodically check for any signs of wear or damage
Can Diamond Stones Be Used for Different Types of Blades?
Yes, diamond stones can sharpen a wide range of blades from kitchen knives to chisels. Even harder steels like those found in high-end pocket knives.
Blade types suitable for diamond stones:
- Kitchen knives (including ceramic knives)
- Pocket knives and EDC blades
- Woodworking tools (chisels, plane irons)
- Garden tools
- Hunting and outdoor knives
Conclusion and Next Steps
Diamond sharpening stones offer many advantages, including speed, durability, and versatility. Following proper maintenance and usage guidelines, you can maximize their lifespan and performance. If you’re ready to take your sharpening skills to the next level. Consider progressing from diamond stones to stropping. to achieve the finest edge on your tools and knives.
Next steps for sharpening enthusiasts:
- Experiment with different grit progressions
- Learn advanced sharpening techniques like convex edges
- Explore stropping for razor-sharp finishes
- Consider building a complete sharpening system with various stones and tools
Mastering the use of diamond sharpening stones. You’ll be well-equipped to maintain all your cutting tools in peak condition. In turn ensuring they perform at their best for years to come.