Edge Pro 250 Grit Diamond Matrix Stone

The 250 Grit Diamond Matrix Stone sits between the 80 grit in raw aggression and the conventional aluminum oxide stones in refinement - a coarse diamond stone built for bevel setting, moderate chip repair, and edge work on harder steels like powdered metal variants that resist softer abrasives. The diamond abrasive cuts consistently across a wide range of steel hardnesses without loading up, and unlike aluminum oxide stones, diamond stones do not dish with use. The substrate is attached to a precision CNC-machined aluminum blank that reduces bow and twist and maintains true, straight geometry across the full sharpening surface. The monocrystalline diamond abrasive is tight in particle size with even distribution, which produces a consistent scratch pattern and reliable results across sessions.

One reviewer who owns most of the Diamond Matrix line describes going from reprofile to near-mirror finish with just four stones, calling the performance well beyond expectations. It is worth being direct about what diamond matrix stones offer versus premium waterstones at a similar grit rating: diamond stones do not wear, stay flat indefinitely, and perform consistently on the hardest steels available. They do not build slurry, and the cutting feedback is different from what waterstone users are accustomed to. One reviewer compared this unfavorably to a 320 grit Shapton GlassStone on cutting feel - a fair observation if you are used to the feedback and speed of a premium Japanese waterstone at this grit level. The advantage of diamond is longevity and consistent geometry, not necessarily the same tactile experience as a hard waterstone.

What Customers Are Saying: Two reviewers with opposing perspectives. One who owns the full Diamond Matrix lineup gives five stars and calls the performance phenomenal - noting four stones take him from reprofiling to a mirror finish. The other gives three stars and finds a Shapton GlassStone 320 outperforms it on cutting feel - a useful comparison for anyone deciding between diamond and waterstone at this grit level. Both are honest assessments of two different sharpening philosophies: diamond for longevity and consistent geometry, premium waterstones for cutting feedback and speed.

• Brand: Edge Pro
• Origin: Made in USA
• Grit: 250
• Abrasive: Monocrystalline Diamond Matrix
• Backing: CNC Machined Aluminum Blank
• Use: Bevel setting, moderate chip repair, hard steel sharpening
• Compatibility: Edge Pro Apex and Professional systems
• Mount: Sold mounted to plate
• Item Number: EDMS-250

Care Instructions: Rinse after use and store dry. Diamond stones do not dish and do not require flattening. Keep dry between sessions. Rinse swarf from the surface during use to maintain cutting efficiency.