"Granite," "Stone," "Diamond," and "Titanium" Nonstick: What the Names Mean

Is granite cookware PFAS-free? The name alone can't tell you, because "granite," "stone," "diamond," and "titanium" describe how a nonstick coating looks or what particles are mixed into it, not the material that makes food slide. This guide explains what each name usually means and how to find out which coating a pan actually has.

At a Glance

• The name describes the speckles, not the coating. "Granite," "stone," "diamond," and "titanium" usually refer to the color or the hard particles in a nonstick layer.
• The coating itself is usually one of two kinds. It is either a fluoropolymer such as PTFE, which is a PFAS, or a silica-based ceramic, which is not a fluoropolymer.
• The same name can cover either kind. In the Ecology Center's 2020 lab tests, a "stone" pan and a "granite diamond" pan were PTFE, while a "titanium ceramic" pan was silica.
• Uncoated versions are a different product. Traditional graniteware is glass enamel on steel, and a bare titanium cooking surface has no coating at all.
• "PFAS-free" is the label that answers the question. A brand's California disclosure or a lab test makes the claim easier to check; "PFOA-free" alone does not settle it.

Is Granite Cookware PFAS-Free?

It depends on the coating under the speckles. A "granite" nonstick pan is usually aluminum with a speckled coating: if that coating is PTFE, the pan has a PFAS cooking surface, and if it is a ceramic (sol-gel) coating, it usually does not. A "PFAS-free" or "made without PFAS" claim is the brand telling you which, and a disclosure or lab result backs it up.

Why the Name Doesn't Tell You the Coating

Think of a nonstick coating as speckles in glue. "Granite," "stone," "diamond," and "titanium" name the speckles: mineral flecks for color, or hard particles that resist scratching. What matters for PFAS is the glue, the binder that holds the particles together and gives the surface its release.

That binder comes in two families:

• Fluoropolymer: PTFE (polytetrafluoroethylene, best known by the brand name Teflon), sometimes blended with its relatives PFA and FEP. All three are carbon chains fully wrapped in fluorine, which makes them PFAS under the OECD definition and under Minnesota's law, which covers any chemical with "at least one fully fluorinated carbon atom."
• Sol-gel ceramic: a thin, glass-like layer of silica (the compound in quartz sand), sprayed on as a liquid and baked hard. It is not a fluoropolymer. Its release comes from ingredients that lower the surface's stickiness, which chemists call surface energy. Our guide to how ceramic nonstick works explains the recipe.

Particles turn up in both families. A 1993 DuPont patent adds hard aluminum oxide particles to a PTFE coating, and a 2024 Thermolon Korea patent adds diamond and colored mica particles to a ceramic one. The particles change how hard or scratch-resistant a coating is; they don't change which family its binder belongs to.

What Each Name Usually Means

Granite and stone

Usually: an aluminum pan with a speckled nonstick coating made to look like stone.
Coating: either family. In the Ecology Center's 2020 tests, which identified each coating's polymer, a "stone" pan and a "granite diamond" pan were both PTFE.
Note: traditional graniteware, the speckled enamel roasting pan, is a different product. One graniteware maker describes a "vitrified enamel coating" on steel: a layer of glass fused to the metal, not a nonstick coating.

Diamond

Usually: a nonstick coating with diamond particles added for hardness.
Coating: either family. The "granite diamond" pan in the 2020 tests was PTFE, while the 2024 patent above puts diamond particles in a ceramic coating.

Titanium

Usually: "titanium nonstick" or "titanium-reinforced" means a coating with titanium in its particles or primer, not a pan made of titanium.
Coating: either family. In the Ecology Center's 2020 tests, a "titanium ceramic" pan tested as silica; in a 2021 follow-up, a PTFE pan described its coating as "granite" with a "titanium hard primer."
Note: a few pans have a bare titanium cooking surface with no coating.

Hard-anodized

Usually: the pan body, not the coating. Hard-anodized aluminum has a hardened oxide layer grown on its surface.
Coating: whatever is applied on top. Both hard-anodized nonstick pans in the Ecology Center's 2020 tests were PTFE.

Why "PFOA-Free" Doesn't Settle It

Many speckled pans carry "PFOA-free" on the box. PFOA was a processing aid once used to make PTFE, not the coating itself, and under an EPA program, eight major companies in the industry committed to work toward eliminating it by 2015, so a PTFE pan sold today is usually PFOA-free too. In the Ecology Center's 2021 follow-up, pans from two brands labeled PFOA-free were coated with PTFE.

For cookware sold in California, the state's cookware law (AB 1200) also bars a "free of" claim for one chemical, such as PFOA, when another chemical from the same group is intentionally added. Our guide to what "PFOA-free" rules out explains the difference.

What Makes a Pan Nonstick Without PFAS?

There are two routes. The first is a sol-gel ceramic coating, which gets its release from a silica surface rather than from fluorine; its slickness can fade with use, so gentle heat and soft utensils help it last. The second is no nonstick coating at all: seasoned cast iron or carbon steel, stainless steel used with preheating and a little fat, enameled cast iron, or a bare titanium surface.

How to Check What's Under the Speckles

1. Read the exact claim. "PFAS-free" or "made without PFAS" covers the whole family; "PTFE-free" rules out the main fluoropolymer; "PFOA-free" alone rules out one chemical.
2. Find the coating type. "Ceramic," "sol-gel," or "silica" points to a ceramic binder. "PTFE," "PFA," "FEP," or "fluoropolymer" points to a PFAS coating.
3. Check the brand's California disclosure. Since 2023, AB 1200 has required makers of cookware sold in California to list intentionally added chemicals from the state's list, including PFAS, on their websites. A fluoropolymer pan should name it there; one brand's disclosure for its nonstick line lists PTFE, FEP, and PFA (checked November 2026).
4. Look for a lab result with a fluorine screen. A total fluorine test measures fluorine from any source, so it catches fluoropolymers. In 2026 tests of pans sold in Australia by the consumer group CHOICE, conventional nonstick measured 310,000 to 730,000 mg/kg (parts per million), while coatings sold as PFAS-free measured 16 to 620 mg/kg, readings several makers attributed to minerals such as mica.

The Bottom Line

"Granite," "stone," "diamond," and "titanium" describe a pan's look or its added particles, so they can't tell you whether it contains PFAS. Look for "PFAS-free" or "made without PFAS," backed by a disclosure or a lab test, or choose an uncoated material. To see how popular pans document their coatings, compare six nonstick pans by coating and evidence.

Sources

1. Ecology Center. What's Cooking? Nonstick pan study (December 2020).
2. Ecology Center. Still Cooking: An update on toxic PFAS in cookware products (October 2021).
3. Interstate Technology and Regulatory Council (ITRC). PFAS: Chemistry, Terminology, and Acronyms (OECD 2021 definition).
4. Minnesota Legislature. Minnesota Statutes 116.943: Products Containing PFAS.
5. Batzar, K. (E. I. du Pont de Nemours and Company). Cookware coating system. U.S. Patent 5,250,356 (1993).
6. Helskens, J., and Park, C. K. (Thermolon Korea). Non-stick ceramic coating comprising diamonds and coloured mica. U.S. Patent 12,012,363 (2024).
7. PPG. Testing standard for sol-gel non-stick coatings.
8. Cinsa. Granite Ware.
9. Our Place. Titanium Always Pan Pro.
10. U.S. EPA. Fact Sheet: 2010/2015 PFOA Stewardship Program.
11. California Attorney General. Enforcement Advisory: AB 1200, PFAS in Cookware and Food Packaging (2023).
12. Made In. AB 1200 disclosure.
13. Gilmour, K. (CHOICE). PFAS-free claims are everywhere. Can you trust them? (2026).