Strap for Datejust 31 Stainless Steel/ Rose Gold / Diamond / Chocolate - Diamond / Oyster

The Rolex Datejust 31 ref. 278381rbr-0027 has a lug width of 16mm. This measurement should be taken with a digital calliper placed between the inner surfaces of the lugs at the point where the strap attaches to the case. Accuracy is essential: a 17mm or 15mm strap will not seat correctly and may cause wear to the lugs over time.

For the Datejust 31 in Rolesor Everose, an alligator strap in vegetable-tanned leather in cognac or tobacco tones is the most coherent choice: the scale texture complements the diamond-set bezel, and the warm tones of Everose gold create natural chromatic continuity. For intensive daily wear, box-calf or shell cordovan offer superior resistance to deformation. A deployant clasp is recommended regardless of material to ensure stability on the 31mm case.

Strap replacement requires a fine-tipped or fork-style spring bar tool, inserted into the lateral hole of the lug to compress the spring bar inward. Work on a soft surface to protect both the case and dial. If using an aftermarket strap with standard 1.5mm spring bars, fitting is straightforward. If in doubt, the Casati Milano atelier offers complimentary fitting by appointment.

Yes. Any strap with a 16mm lug width and standard spring bars is compatible with the Datejust 31 278381rbr-0027. Milano Straps offers a curated selection of handcrafted straps in various materials — alligator, calf leather, NATO, rubber — all produced at this width. Quality aftermarket straps often surpass OEM bracelets in longevity and comfort, particularly those in vegetable-tanned leather that develop a natural patina over time.

The lifespan of a leather strap depends on the material, tanning process and frequency of use. A vegetable-tanned alligator strap, maintained with neutral cream and kept away from direct heat sources, typically lasts between 3 and 5 years with daily wear. Calf leather has a shorter life cycle (2–3 years) but is less costly to replace. Shell cordovan, owing to the density of its fibres, can exceed 5 years while retaining its shape. All Casati Milano straps carry an 18-month warranty against manufacturing defects.