Strap for Datejust 31 Stainless Steel Domed Diamond / Oyster / Black - Arabic

The Rolex Datejust 31 reference 178344-0058 has a lug width of 16mm. This measurement should be taken with a vernier calliper positioned internally between the two lugs at their narrowest point. Any aftermarket strap must match this specification to ensure correct spring bar fitment.

For the Datejust 31 in white gold and steel, hornback alligator leather and shell cordovan are the most appropriate materials: the former for its three-dimensional grain texture that complements the diamond-set bezel, the latter for its natural compactness and lustre. A deployant clasp is recommended regardless of material, as it reduces wear and ensures a consistent fit on the wrist. Rubber straps are ideal for intensive daily use, given their compatibility with the 100-metre Oyster water resistance.

To replace the strap on a Datejust 31, a fine-tipped spring bar tool is required. Insert the tip into the lug slot, compress the spring bar and slide the strap free. Care should be taken not to scratch the polished case surfaces: place the watch face-down on a soft cloth and work under adequate lighting. Milano Straps supplies spring bars with all straps.

Yes. Any strap with a 16mm lug width and a flat attachment profile is compatible with the Datejust 31. Milano Straps offers a curated selection of handcrafted straps calibrated to this specification, available in alligator, calf, shell cordovan and rubber. The Casati Milano atelier also produces fully bespoke straps with direct leather selection and personalised finishing.

Longevity depends on the material and conditions of use. A quality alligator strap, with daily use and proper maintenance — avoiding prolonged contact with water and perspiration, and rotating between multiple straps — typically lasts between 2 and 4 years. Shell cordovan, owing to the density of its fibres, tends to last longer while developing a distinguished patina. Vegetable-tanned leather straps require periodic treatment with leather conditioner to maintain flexibility. Casati Milano provides an 18-month guarantee against manufacturing defects.