The most important ingredient in a knife is its steel.DiamondBlade Knives claims its steel is the best and most balanced you can get, thanks to a unique forging process.

　　DiamondBlade Knives Friction Forged D2 steel supposedly has 10 times finer steel grain than traditional D2. The brand says that process makes the edges of its knives harder, thinner, and tougher. The website claims its knives will outperform any other knife by 10 times — or better — guaranteed.

　　Those are big, bold claims. But DiamondBlade Knives developed this Friction Forged technology in collaboration with Brigham Young University (BYU). Its patented, and clearly, the brand is confident in its qualities. So when I got my hands on a DiamondBlade knife, I was immediately itching to test it. The brand calls the Friction Forging knives Super Blades, after all.

　　I got the DiamondBlade Summit Folder a year ago (October 2023). Since then, Ive used it to field dress my first whitetail deer, cut paracord on countless camping trips, chop veggies and meats, slice tops off beer cans, split wood, and make shavings for firestarter. I even started carrying it around as an everyday carry knife.

　　But does its Friction Forged D2 makeup make it 10 times better than every other knife on the market? The jury is still out. While some experts have expressed doubt, Im not saying no just yet.

　　In short: The DiamondBlade Knives Summit Folder ($295) sports a 3.375-inch Friction Forged D2 blade and a G10 handle. It is a full-sized folding hunting knife that holds an edge remarkably well. In months of testing and daily use I havent seen a single spot of rust. This knife feels good, looks good, and seems to be as high quality as its makers claim. For its price, Im glad thats the case.

　　If youre shopping for hunting and survival knives, check out our guide to the Best Survival Knives.

　　DiamondBlade Knives Summit Folder

　　(Photo/DiamondBlades) Specs Steel Friction Forged D2 Blade length 3.375 Knife length 8.75 5 closed Blade RC hardness 65-68 Spine RC hardness 42-44 Blade bevel 16-18° Knife weight 3.5 oz. Blade thickness 0.118-0.120 Blade depth 1 max Blade style Drop point Pros Extremely sharp, holds edge very well Easy and fast to sharpen Comfortable grip Lifetime warranty Cons Bulky sheath No pocket clip Very expensive Will Brendza Check Price at DiamondBlades Super Blade Steel: A Disclaimer Before I start, I need to note that GearJunkie couldnt procure true metallurgy tests to confirm or refute DiamondBlades quantitative claims of its Friction Forged D2 steel.

　　I reached out to a local company that could test the blade, but the cost of testing a single knife for this review was prohibitively expensive. Without testing the steel, that metallurgist declined to comment on the brands claims.

　　I did speak with another knife and metal expert (youll hear from them shortly), but most of what follows are qualitative observations based on my own field testing. This knife saw a lot of hard everyday carry (EDC) use through a long camping season in the Rockies. It cut wood, paracord, cardboard, leather, deer flesh, human flesh (accidentally), food, plastic, aluminum, and more.

　　This has become the knife I put on my belt every morning.

　　What Is Friction Forged D2 Steel? The DiamondBlade Knives website has an entire page dedicated to its Friction Forged process and the science behind making D2 steel into Super Blades. It gets deep in the weeds. The brand spent a lot of time and money on RD for this tech. Ill avoid getting too detailed, but its worth understanding why the brand claims that its Summit Folder is such a special knife.

　　Friction Forging uses a very specific tool made from Polycrystalline Cubic Boron Nitride (PCBN) to penetrate the blade as it rotates, creating frictional heating. That also allows the knife maker to achieve differential heat treatment — making the spine softer and blade edge harder with stainless and high-alloy steels.

　　(Photo/Will Brendza) During the process, the PCBN tool moves along the piece of steel that will become the blades edge, continually forging it as it does so. That brings it to the transformational temperature that produces fine-grain steel structures. Those are so small, the brand claims, they can only be seen with electron microscopes.

　　DiamondBlade claims that the exceptionally fine grain of its Friction Forged D2 allows it to make a thinner, non-brittle blade with an ultra-hard, long-lasting edge. For materials nerds, that might sound too good to be true. Typically, harder steels are more brittle than softer steels. That is not the case with Diamond Blades Friction Forged Steel, the brand alleges.

　　DiamondBlade Knives Summit Folder Review

　　(Photo/Will Brendza) When I shot my first whitetail in Nebraska last fall, the Summit Folder was the knife I field-dressed it with. It made the process feel almost too easy, but that was right out of the box when the knife still had a factory-sharp edge.

　　I tried not to let those exciting first impressions go to my head as I continued using it. But the knife continued to impress me. While camping, I used it for everything from batoning wood to cutting paracord, slicing aluminum cans, and prepping veggies. I even used it as a steak knife one night. As a knife, the Summit Folder is an extremely effective tool for general camping purposes.

　　It has a satisfying 3.5-ounce weight. The handle is ergonomic and made from G1. In your hand, this knife feels very solid and wieldable.

　　I really appreciate the 3.375-in. blade length. Its long enough to accomplish hardier tasks like splitting wood or field dressing. But because its a folder, it also isnt too big for EDC. Length-wise, in my opinion, the Summit Folder hits the sweet spot.

　　(Photo/Will Brendza) Edge Retention In the last year and a half, there have been two other primary folding knives Ive used — both from prominent, recognizable knife brands. One of them used S30V steel, and the other used S35VN.

　　Unfortunately, I do not own another D2 steel-bladed knife with which to make a direct comparison. But I can tell you that the Summit Folder has kept a notably sharper edge than both of those other knives over similar testing periods.

　　I also dont have an electron microscope. So I cant tell you exactly how well the blades edge is holding up. I wont say that it has remained as sharp as it was the day I got it. But it has definitely stayed sharper for longer than other knives Ive used.

　　DiamondBlades provides data from its own CATRA edge retention tests on its webpage for Friction Forged. It claims this test showed that Friction Forged steel cuts 50% more material per stroke at the outset and that it stayed sharper than the other knife steels DiamondBlades tested. A strokes to dull test indicated it maintained its sharpness after more cutting than other steels did.

　　However, just below that, DiamondBlades shows data from a cutting life test that shows Friction Forged steel actually performed worse than other steels. So even DiamondBlades own tests leave room for interpretation. Its kind of hard to parse out.

　　If you want to see the data for yourself, scroll down to the Testing section on the Friction Forged Technology webpage.

　　(Photo/Will Brendza) Sharpening I didnt need to sharpen the Summit Folder, but easy to sharpen is one of DiamondBlades big selling points for its Friction Forged blades. So I had to try. I put it in a lineup with a couple of other pocket folders and two of my kitchen knives that needed a little whetstone love and made an evening of it.

　　Softer steels sharpen easier, and the bladed edge of the Diamond Blades knife has a hardness of 65-69 HRC, according to DiamondBlades — thats compared to the typical 54–62 HRC hardness of regular D2 tool steel. Its hard stuff. The honing progress is incremental, but it wasnt prohibitively tough. It might just take a little longer, depending on how dull the blade has become.

　　It would pay off to hone this blade regularly so you dont have to work too hard to regain its edge.

　　(Photo/Will Brendza) Handling At 3.375 inches, the blade is a very functional length. Its big enough to perform more significant tasks without losing maneuverability points. Its relatively thin at 0.118-0.120 inches wide, which feels nimble in use compared to some chunkier blades I own.

　　A full inch of jimping on the spine of the blade offers some serious thumb control, too.

　　The G10 handle is comfortable, ergonomic, and easy to hold. Its a surprisingly light knife for its size (3.5 ounces), but the weight feels good in your palm.

　　(Photo/Will Brendza) Action Lock The DiamondBlade Knives Summit Folder uses a traditional lock-back design. Its simple. It doesnt snap open easily with a flick of the wrist. But there is a small hex screw where the blade connects to the handle. If you really wanted to, you could loosen that slightly to make the action easier.

　　Overall, though, opening and closing this knife is smooth. There is no give or looseness in the blade, whether its open or closed.

　　Limited Carry Options The Diamond Blades Summit Folder does not have a pocket clip. Instead, it uses a sheath. DiamondBlade Knives offers both nylon and leather options. The tooled leather sheath costs $20 more and has a nice, classy flair.

　　My only issue with it is that its bulky. It looks like youre carrying a Palm Pilot on your belt. I ended up trimming the leather on the clip so its a little lower profile.

　　For people who carry multitools or cellphones on their belts, it wont be a bother. But Im not used to having something so big on my hip, and it kind of throws me off. I really wish this thing had a pocket clip.

　　(Photo/Will Brendza) There is a lanyard aperture on the handle, so you could wear it around your neck. But that might look and feel even weirder.

　　The advantage of the sheath? Its nearly impossible to lose this knife. Ive had folding knives with pocket clips that get snagged on jackets and yanked out. Ive actually lost knives because of loose pocket clips. Thats never going to happen with the Summit Folder as long as its securely buttoned up in its sheath.

　　DiamondBlade Summit Folder Price Folding knives are a broad category and their prices vary significantly. This folding knife is the exact sameblade size and shape as DiamondBlades flagship fixed-blade, the Summit. Both versions of the Summit are classified as hunting knives and lean distinctly more toward survival applications than everyday carry (EDC).

　　Compared to the other knives on GearJunkies guide to the Best Survival Knives, the DiamondBlade Summit Folder is on the pricey end of the spectrum at $295. It would rank third for the most expensive blade on the list.

　　(Photo/Will Brendza) The most comparable knife on that list would probably be the Benchmade Anonimus, which uses Benchmades improved version of D2, which it calls CruWear. That fixed blade is slightly bigger than the Summit Folder, with a full length of 9.83 inches (compared to the Summit Folders 8.75-inch length). But it is in the same price range at $275.

　　What Does an Expert Think? As noted, I am not a materials scientist, nor do I have the equipment or resources to have this Friction Forged steel lab tested to verify DiamondBlades claims of steel superiority.

　　However, I was able to contact Larrin Thomas, a steel metallurgist in Pittsburgh, PA, and the founder of the blog Knife Steel Nerds, to talk about steel grain. Thomas has a PhD in Metallurgical and Materials Engineering from the Colorado School of Mines. He offered some interesting perspectives on Friction steel.

　　Diamond Blades claims that its Friction Forging process creates steel grain structures that are 10x finer than those of traditional D2 steel. However, Thomas believes that its more likely that the steel grain structures, while still very small, arent quite that microscopic.

　　According to Thomas, There is at least one published study on friction forging of D2 tool steel where they found the friction forged D2 to have a grain size of 2.3 microns. This is a very fine grain size but is significantly larger than the 0.5-micron claim of DiamondBlades. The 2.3 microns measurement would likely be more reasonable.

　　Thomas said that there is a small improvement in carbide size with Friction Forged steel. But he adds that powder metallurgy is much better for making the carbide size both smaller and more consistent.

　　I think it is interesting and unique, Thomas said of the Friction Forged steel from DiamondBlades. Though, for me, I would rather use powder metallurgy steel for its superior carbide structure.

　　DiamondBlade Knives Summit Folder: Who Is It For?

　　(Photo/Will Brendza) If you are a frequent knife user who likes larger-sized blades that you dont have to sharpen often, DiamondBlade Knives made the Summit Folder for you. Its a very capable knife with an extremely sharp blade that holds its edge very well.

　　I cant confirm or deny that it will outperform any other knife by 10 times — thats just an impossible claim to test without access to a lab. But I can say for sure the edge on this blade outlasted the other two Ive been using and testing in the last year.

　　I can also tell you that it regained that edge when I put it to a whetstone (with some elbow grease). And I can confirm that I havent seen a single chip or bite along the Friction Forged edge despite a year of use.

　　Honestly, I like this knife so much Ive been trying to wear it day-to-day. It might be overkill, though. Especially with that bulky sheath, this knife is hard to use for EDC. Although it is legal to carry in my state of Colorado, as the blade falls a hairs width below the legal length limit. Still, Id need a pocket clip to make daily carry realistic for me.

　　The point is, I like this knife so much I want to use it more than I can. Im looking for any opportunity to cut, slice, or trim things when my Summit Folder is on me.

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　　Will Brendza Check Price at DiamondBlades