Grade 2 Titanium is what the trade calls commercially pure, or CP, titanium: roughly 99% titanium, unalloyed, with none of the aluminium and vanadium found in Grade 5. That makes it softer but far easier to form and machine. Minimum yield strength sits around 275 MPa, with tensile strength running from about 345 to 485 MPa. The appeal, though, was never raw strength. Grade 2 builds a self-forming oxide layer that reseals itself if scratched, giving outstanding corrosion resistance, and because it carries no nickel it is fully hypoallergenic, the same metal family used in medical implants. That is also why it nearly disappears on the wrist.
The clearest brand example is Citizen. The company starts with Grade 2 Titanium, then applies its Duratect surface hardening to create Super Titanium, marketed as roughly five times harder than stainless steel. The 41mm Citizen Promaster Mechanical Diver 200M "Fujitsubo" NB6021 shows it off well: the blue-dial NB6021-68L on a titanium bracelet lists around £800, while the black-dial NB6021-17E on a polyurethane strap runs closer to £560. Citizen's Attesa line mostly lands between £950 and £1,750. On the Seiko side, several standard references (pieces from the SARX and SARW families, for instance) pair commercially pure titanium with a Diashield coating, whereas Grand Seiko avoids CP titanium entirely and reaches for alloys like High-Intensity Titanium.
The single thing to know before buying is that bare Grade 2 Titanium dents and scratches more readily than 316L steel or Grade 5. Serious makers rarely leave it raw, which is why hardening layers like Citizen's Duratect or Seiko's Diashield are almost the default. It suits anyone with a metal allergy, anyone chasing genuine lightness, and anyone who wants a case that shrugs off sweat, seawater and daily office wear. The trade-off is honest: if maximum scratch resistance is the priority, go Grade 5 or insist on a hardened coating; if absolute lightness and skin comfort lead your list, Grade 2 is hard to beat.
For a more advanced wrinkle, Citizen introduced recrystallised titanium with its 2025 Attesa Platinum Shine collection, marking 55 years since its first titanium watch. Grade 2 Titanium is heat-treated at high temperature with controlled cooling, producing a surface pattern unique to each piece that recalls the Widmanstatten figures in meteorites, then topped with Duratect Platinum DLC. The CC4076-65A Satellite Wave GPS sits near £1,950 and the AT8284-61A around £995, proof that a humble base material can be pushed a long way with the right finishing.