Strap for Datejust 31 Yellow Gold / Domed / Silver - Diamond / President

The Rolex Datejust 31 reference 278248-0034 has a lug width of 16mm. This measurement is specific to the 31mm case size and differs from the 20mm lugs of the Datejust 41 or the 19mm lugs found on certain vintage references. To verify the measurement on your own piece, use a calliper between the lugs parallel to the case, measuring at the inner face.

For an 18-carat yellow gold case, an alligator strap in vegetable-tanned leather in dark chocolate, bordeaux or black provides the most coherent aesthetic pairing. The square belly grain of alligator develops a patina over time that complements the warm metal tones. Shell cordovan is a high-end alternative for those who prefer a smoother, more lustrous texture.

The strap on the Datejust 31 is removed using a springbar tool inserted into the small hole on the lug. The springbar spring is compressed inward on both sides to release it from the lugs. The operation does not require opening the case and does not void the warranty if carried out correctly without scratching the surfaces. A watch cushion is recommended to protect the case during the replacement.

Yes. Aftermarket straps with a 16mm lug width are produced by several artisan workshops, including Casati Milano, which crafts bespoke straps specifically for this format. It is essential to verify that the strap explicitly states compatibility with 16mm lugs and that the curved ends are shaped to fit the 31mm Oyster case. The models listed online on milanostraps.it for 16mm lugs are already curated for this compatibility.

The lifespan of a leather strap depends on the material and daily use. A quality vegetable-tanned alligator strap, used with care and rotated with a second strap, can last between 3 and 5 years while maintaining a dignified patina. Shell cordovan is notably more resistant to deformation over time. Frequent exposure to water, perspiration and perfume accelerates the degradation of any leather: for intensive or sporting use, a vulcanised rubber strap is recommended.