Granitestone Nutriblade: What It Is and Whether It's Worth Buying

The Granitestone Nutriblade is a knife set marketed heavily through TV infomercials and online ads, positioned as a "professional-grade" kitchen knife with a distinctive non-stick coating and a dramatic pitch about never needing sharpening. If you've seen the ads and are wondering whether the product lives up to them, the answer is more nuanced than either the marketing or the skeptics suggest.

Here's an honest breakdown of what the Nutriblade actually is, how it compares to other knives in its price range, and who it actually makes sense for.

What Is the Granitestone Nutriblade

Granitestone is primarily known for non-stick cookware. Their foray into knives with the Nutriblade applies a similar non-stick coating concept to knife blades. The knives feature a speckled granite-effect coating on the blade surface, claimed to reduce food sticking and make cleanup easier.

The typical Nutriblade set sold on TV and online includes: - A chef's knife (usually around 8 inches) - A bread knife - A carving/slicing knife - A santoku knife - Sometimes a utility knife and/or paring knife

Sets vary depending on where and when you buy. The TV-sold versions often include bonus items like a block, kitchen shears, or a sharpener.

The Steel and Construction

Granitestone doesn't publish detailed metallurgical specs for the Nutriblade, which is telling. Based on what can be determined from independent testing and buyer feedback, the knives use 420-series stainless steel or a similar mid-grade alloy.

420-series steel is workable for kitchen use but is softer than the 1.4116 German steel used by brands like Victorinox, and much softer than Japanese steels. At a Rockwell hardness of around 52-55 HRC, these knives will feel sharp out of the box (they come factory-sharpened) but will dull faster than harder alternatives.

This matters particularly given the marketing claim about "never needing sharpening." That claim is not accurate. Every knife needs sharpening eventually. A softer steel knife needs it sooner.

What the Non-Stick Coating Does (and Doesn't Do)

The speckled coating on the blade surface does reduce sticking to some degree. This is most noticeable with sticky foods like cooked potatoes, cheese, or fish. You'll spend slightly less time pulling food off the blade with each stroke compared to a plain stainless blade.

What the coating doesn't do: - It doesn't affect sharpness or cutting performance - It doesn't protect the edge from dulling - It doesn't make the knife more corrosion-resistant - It will wear at the cutting edge over time, and the area near the edge will look different from the coated flat of the blade

The coating is purely cosmetic and functional at the blade surface. The cutting edge itself is still bare steel making contact with food and cutting boards.

How the Nutriblade Performs in Practice

For basic home cooking tasks, the Nutriblade performs acceptably. Chopping onions, slicing tomatoes, cutting chicken breasts, portioning vegetables. Out of the box, the knives are sharp enough for these tasks.

The drop-off in performance comes with time. Within a few months of daily cooking, you'll likely notice the edge dulling to the point where it requires more pressure to cut than it should. A sharp honing rod or basic pull-through sharpener will restore it, but the "never needs sharpening" claim doesn't hold up.

Compared to a Victorinox Fibrox chef's knife at a similar or only slightly higher price: - The Victorinox uses harder steel (1.4116 vs. 420-series), holds an edge considerably longer - The Fibrox handle is ergonomically purpose-built for kitchen grip - The Victorinox has been a professional kitchen standard for decades; the Nutriblade has not

That said, the Nutriblade is a cut above the worst of the infomercial knife market. It's not a great knife, but it's a functional one.

The TV Price vs. Reality

Part of the Nutriblade marketing is a sense of scarcity and TV-only pricing. In practice, these sets are available on Amazon and other online retailers year-round. The Amazon price for a standard 6-piece set typically runs $30-50.

At that price, it's a reasonable budget purchase for someone setting up a first kitchen or someone who cooks infrequently and doesn't want to invest in premium knives. For frequent cooks who value performance and longevity, that same budget gets you better options.

For a broader look at what the market offers, our Best Kitchen Knives roundup includes budget options that compete directly with the Nutriblade at similar price points.

Who the Nutriblade Makes Sense For

Infrequent home cooks: If you cook two or three times a week doing basic prep work, the Nutriblade will serve you fine for years. You won't notice the edge degradation as quickly as a daily cook would.

Kitchen starters: Setting up a first apartment kitchen and just need knives that work? The Nutriblade gets the job done at a low entry cost.

Gift recipients who aren't knife people: Someone who won't notice or care about performance nuances will appreciate the look of the set and the functional sharpness when it's new.

Who should look elsewhere:

Serious home cooks, anyone cooking daily, and anyone who's already had a quality knife and knows what edge retention feels like should spend a bit more and look at Victorinox Fibrox, Cuisinart's Classic line, or even Henckels' entry-level International line. All of these use harder steel and will perform noticeably better over time.

Cleaning and Maintenance

The Nutriblade sets are marketed as dishwasher-safe. From a practical standpoint, hand washing will significantly extend the life of both the coating and the edge. Dishwashers are hard on knife edges in any steel, and the coating will start showing wear faster with repeated dishwasher cycles.

Dry the blades after washing. The coating covers the sides of the blade but the edge itself is bare steel, and regular moisture exposure can cause edge micro-corrosion.

If and when the knives dull, a basic pull-through sharpener works fine with this steel. A few passes will restore a usable edge. You won't be sharpening on whetstones for these knives; that level of precision isn't necessary or worth it given the steel quality.

FAQ

Does the Granitestone Nutriblade really never need sharpening? No. This is a marketing claim that doesn't hold up in practice. The knives ship sharp, but all knife edges dull with use. At the steel hardness used in the Nutriblade, you'll likely need to sharpen or hone within a few months of regular cooking.

Is the non-stick coating safe for food contact? Granitestone's coating is FDA-compliant and marketed as free of PTFE, PFOA, lead, and cadmium. The same non-stick safety profile as their cookware line. No concerns from a safety standpoint.

How does the Nutriblade compare to Chicago Cutlery? Broadly comparable. Chicago Cutlery uses high-carbon stainless steel that's somewhat harder than typical 420-series, giving it slightly better edge retention. Both are budget-segment knives. Chicago Cutlery has a stronger performance pedigree.

Can you sharpen the Nutriblade on a whetstone? Yes, the coating will wear at the edge but the steel underneath is sharpenable on a whetstone. However, the soft steel of these knives means the whetstone investment isn't really worth it. A pull-through or electric sharpener is more appropriate.

The Bottom Line

The Granitestone Nutriblade is a functional budget knife set that performs adequately for basic home cooking. The non-stick coating is a genuine minor benefit. The marketing claims about not needing sharpening are exaggerated.

At $30-50, it's an acceptable starting point for new cooks or low-frequency home use. For anyone who cooks seriously or wants knives that last, spending $60-100 on a Victorinox or Henckels entry-level set will deliver noticeably better performance and longevity.