Diamond-infused. Diamond-reinforced. Diamond-coated. Diamond technology. These terms appear on cookware and air fryer packaging with increasing frequency, and they work exactly as intended: they make the product sound premium, durable, and implicitly safe. Diamonds are natural, inert, and associated with quality. Who would worry about a diamond coating?
The marketing is effective, but it obscures the question that actually matters for families. Diamond particles are a minor additive - typically less than 1% of the total coating weight. The other 99% is the base nonstick coating, and that base determines whether the product contains PTFE, PFAS, or neither. "Diamond-infused" tells you about the hardness additive. It tells you nothing about the chemistry that provides the nonstick function.
What Diamond-Infused Coatings Actually Are
Diamond-infused nonstick coatings are conventional nonstick coatings - either PTFE-based or ceramic sol-gel - with fine diamond particles mixed into the formulation. The diamond particles serve a mechanical function: they increase the hardness of the coating surface, improve scratch resistance, and can extend the usable life of the nonstick layer.
The diamond particles themselves are chemically inert. Pure carbon in a crystalline structure, diamond does not react with food, does not leach chemicals at cooking temperatures, and poses no known health risk. If your only concern were the diamond component, there would be nothing to investigate.
But diamond particles are not the coating. They are embedded in a coating matrix, and that matrix is where the health-relevant chemistry lives.