Strap for Datejust 31 Yellow Gold Diamond / President / Black MOP Computer

The Rolex Datejust 31 reference 178288-0016 has a lug width of 16mm. This measurement is taken internally between the two lugs using a digital calliper, with no strap fitted. It is essential to use straps manufactured precisely for this width, as even a 1mm discrepancy will affect both the fitment and the overall aesthetic on the wrist.

For the yellow gold Datejust 31, an alligator strap in vegetable-tanned leather is the most coherent choice with the watch's positioning: it complements the precious case, develops a distinguished patina over time, and offers a naturally refined texture. Box-calf leather is the most formal alternative, while shell cordovan provides exceptional durability with a noble ageing process. For daily or active wear, vulcanised rubber is the most functional option.

To replace the strap on the Datejust 31, you will need a spring bar tool or a precision flat-head screwdriver to remove the spring bars connecting the strap to the case lugs. It is advisable to work on a soft surface to protect the yellow gold case from accidental scratches. If in doubt, entrust the operation to a professional watchmaker or a specialist atelier such as Casati Milano.

Yes. A number of artisan manufacturers produce aftermarket straps with a 16mm lug width compatible with the Datejust 31 reference 178288-0016. Milano Straps offers a curated selection of 16mm straps in various materials — alligator, calf leather, shell cordovan, rubber — fitted with standard 1.5mm spring bars compatible with original Rolex lugs. The choice of material and craftsmanship quality are key factors in enhancing the 18ct yellow gold case.

The lifespan of a leather strap depends on the material, the tanning process, and daily wear conditions. A vegetable-tanned alligator strap, properly maintained with appropriate conditioning products and kept away from prolonged water exposure, can last between three and six years while retaining a distinguished appearance. Shell cordovan, thanks to its dense fibre structure, often lasts even longer, maintaining a clean edge over time. Avoiding prolonged exposure to perspiration, water, and direct sunlight will significantly extend the strap's service life.