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

The Rolex Datejust 31 ref. 178158-0018 has a lug width of 16mm. This measurement, taken between the lugs using a digital calliper placed directly on the case, determines compatibility with any aftermarket strap. It is advisable to measure the watch itself rather than relying on the original bracelet dimensions, as the end links may differ slightly.

For the Datejust 31 in yellow gold, alligator straps in glossy belly cut — in cognac, havana or burgundy — represent the most aesthetically coherent choice: the rectangular grain echoes the fluted bezel and complements the warm tones of the gold. Alternatively, vegetable-tanned calf leather develops an authentic patina over time, while shell cordovan offers an exceptionally compact and refined surface. For a more casual, versatile option, a two-tone nylon NATO strap is a lightweight and reversible solution.

To replace the strap on a Datejust 31, a fine-tipped spring bar tool is required. By pressing the spring bar buttons at the sides of the lugs, the bars compress and the existing bracelet or strap can be removed. Care must be taken not to scratch the gold lugs. It is advisable to entrust this operation to a watchmaker or professional service, particularly on precious metal cases where even minor marks may require polishing.

Yes, there is a wide range of aftermarket straps compatible with the Datejust 31 ref. 178158-0018, all requiring a 16mm lug width. Milano Straps offers a curated selection of handcrafted straps in alligator, calf leather, shell cordovan and nylon, specifically made for this size, with shaped ends compatible with the Oyster lugs of the Datejust 31. Their build quality and attention to detail make them a fitting match for this timepiece.

The lifespan of a leather strap depends on the quality of the tanning process, the wearer's habits and the frequency of use. A high-grade alligator strap, kept away from water and excessive perspiration and rotated regularly with other straps, can last between 3 and 7 years. Vegetable-tanned calf leather has a similar lifespan but develops a desirable patina over time. Shell cordovan, owing to the density of its fibre structure, is the most durable of all fine leathers. Milano Straps provides an 18-month guarantee against manufacturing defects.