Strap for Datejust 31 White Gold Diamond / President / Pink MOP

The lug width of the Rolex Datejust 31 ref. 178159-0002 is precisely 16mm. This measurement is taken between the inner lugs of the case, without compressing the spring bars. A common error is measuring from outer lug to outer lug, which produces an overestimation of 1–2mm and renders straps for 16mm incompatible. Accuracy is critical: a 14mm or 18mm strap will not fit correctly.

Alligator leather in cognac or dark brown shades represents the historical choice for this model: the structured grain contrasts elegantly with the lustre of white gold. Alternatively, grained calf in navy or black permits more contemporary chromatic compositions. Shell cordovan, with its lustre that evolves over time, creates a sophisticated dialogue with white gold. For sport-elegant use, pearl-grey calf or a cotton-linen NATO strap demystifies the piece while maintaining stylistic coherence.

Strap replacement requires precision. Position the watch with the strap facing upward, insert a spring bar tool or dedicated instrument into the small aperture beneath the lug, and gently lift the inner lug until the spring releases. Repeat on the other side. Verify that the spring bar bushings remain intact—never force. For Rolex models with white gold lugs, such as the 178159-0002, we recommend entrusting the first change to an experienced watchmaker to avoid scratching the precious metal.

Yes, but the selection is limited by the specificity of the 16mm lug width and the need to maintain aesthetic coherence with white gold. Milano Straps offers an exclusive collection of artisanal straps in alligator, calf, and shell cordovan, custom-made for 16mm lugs. These aftermarket straps respect Rolex construction standards (buckle thickness, keeper positioning) and represent superior qualitative choice against generic suppliers. Compatible straps are available online in the 16mm lug width collection.

Durability depends on material, frequency of use, and maintenance. A quality artisanal alligator or calf, subjected to vegetable tanning, maintains structural integrity for 5–8 years of daily wear. Patina—the natural ageing of leather—is desirable and communicates history of use. Shell cordovan, owing to its fibrous density, easily achieves 10+ years. Factors that reduce longevity: prolonged exposure to unsalted fresh water, extreme humidity, chronic flexing of the strap when the watch is unworn. With proper maintenance (semi-annual conditioning, gentle cleaning), an artisanal strap remains functional and aesthetically pleasing well beyond the initial threshold.