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A polished tungsten carbide band on a clean white surface.Tungsten carbide is safe for everyday wear and is generally well tolerated, including by people who react to other metals. But the phrase “hypoallergenic tungsten” hides a detail that decides whether a particular ring will suit you, and it is worth understanding.A tungsten ring is not pure tungstenTungsten carbide is a composite. Hard tungsten carbide particles are held together by a metallic binder, and the whole mixture is sintered under heat and pressure into a solid. The tungsten carbide itself is chemically stable and inert against skin.The binder is the variable....

A cleanly cracked tungsten carbide band beside an intact polished band.Yes. A tungsten carbide ring can crack, and if you strike one hard enough on a concrete floor or a steel edge, it may break into clean pieces rather than dent. This surprises people who were told tungsten is the toughest ring material available. Both things are true at once, and understanding why will probably make you want the ring more, not less.Hardness and toughness are different propertiesHardness measures resistance to being scratched or deformed. Toughness measures resistance to cracking under sudden force. Materials engineering trades one against the other...

Polished tungsten carbide band beside a visibly scratched softer silver-tone band.The short answer is that tungsten carbide resists scratching better than almost anything else you can reasonably wear on a finger — but “scratch-proof” and “scratch-resistant” are not the same claim, and the difference matters when you are choosing a band you intend to keep.Where tungsten sits on the hardness scaleJewellers measure scratch resistance with the Mohs scale, where talc is 1 and diamond is 10. Tungsten carbide lands around 8 to 9. For comparison, hardened steel is roughly 7, titanium is about 6, and the gold and silver used...