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

The lug width of the Rolex Datejust 31 278343rbr-0025 is 16mm. This measurement is precise and admits no tolerance: it must be measured perpendicularly between the two spring bars using a digital calliper. Installing straps of different widths (17mm, 18mm) compromises both aesthetics and the structural integrity of the lugs. The 16mm width is consistent with the proportions of the 31mm case according to Rolex's construction standards.

For this bicolour yellow gold and steel reference, alligator is the most appropriate choice: its characteristic geometric texture, natural lustre, and lightweight construction make it ideal. Alternatively, calf leather with vegetable tanning offers colour evolution over time and superior artisanal authenticity. For formal occasions, polished black alligator creates the classic gold/steel/black combination. For daily wear, vegetable-tanned grained calf ensures comfort and longevity, becoming a unique piece after months of use.

Changing the strap requires removal of the spring bars (pins) that connect the strap to the case. Use a dedicated tool (spring bar tool) to compress the internal spring of the bar, carefully extracting it from one side. Once the old strap is free, the new one (16mm lug width) can be inserted by aligning its ends with the bars, then releasing the spring for attachment. This operation should be performed carefully to avoid scratching the case. Alternatively, entrust the task to an authorised Rolex service centre or a quality watchmaker.

Yes, any strap with a 16mm lug width is physically compatible with the Datejust 31 278343rbr-0025, provided it is constructed to adequate standards (correctly positioned spring bars, proportionate lugs, durable material). Milano Straps offers artisanal 16mm straps in premium materials—alligator, calf, shell cordovan, vegetable tanning—all compatible and certified for this reference. Always verify that the mounted strap does not show detachment in the lugs after installation.

The lifespan of a leather strap depends on frequency of use, material type, and construction quality. A high-quality alligator or calf strap (such as Milano Straps' artisanal options) typically lasts 3–5 years with moderate daily use, potentially reaching 7–10 years with occasional wear. Vegetable-tanned leather tends to age better aesthetically (colour evolution), though it may require periodic maintenance (cleaning, conditioning). Extreme environmental conditions (intense heat, persistent humidity) shorten useful life. Casati Milano offers an 18-month warranty on manufacturing defects for all artisanal straps.