Strap for Datejust 31 Stainless Steel / Yellow Gold / Domed - Diamond / Champagne - Diamond / Jubilee

The lug width of the Rolex Datejust 31 reference 278343rbr-0026 is 16 mm. This measurement is taken internally between the two lugs, perpendicular to the case axis, and is the exact figure required when purchasing any compatible aftermarket strap.

For the Datejust 31 in yellow Rolesor with diamond bezel, a glossy alligator strap in cognac or tobacco is the most aesthetically coherent choice, as the natural scale grain and warm tone complement the 18kt yellow gold. A vegetable-tanned calf leather strap in brown or bottle green offers greater everyday versatility. In both cases, a deployant clasp provides the most refined wear experience.

To replace the strap on the Datejust 31, you will need a spring bar tool with a tip measuring 0.6–0.8 mm in thickness. Insert the tool into the small notch at the side of the lug to compress the spring bars and release the strap. Care must be taken to avoid scratching the Oystersteel case. For a flawless result on a diamond-set Rolesor piece, it is advisable to consult a watchmaker or the Casati Milano atelier.

Yes, there are numerous aftermarket straps with a 16 mm lug width compatible with this model. Milano Straps offers handcrafted options in alligator, calf leather, shell cordovan, and rubber, with customisable taper and length. It is essential to confirm that the strap width at the lug is precisely 16 mm and that the end piece is flat, suited to the Oyster case of the Datejust 31.

Longevity depends primarily on the quality of the tanning process and conditions of use. A vegetable-tanned calf leather strap, with proper care — avoiding prolonged exposure to water and perspiration, and applying a leather conditioner every 3–4 months — will typically last 2–4 years. Shell cordovan and high-grade alligator can exceed 5 years while retaining structural integrity. Milano Straps provides an 18-month guarantee against manufacturing defects.