Strap for Datejust 31 Yellow Gold Fluted / Oyster / Steel Roman

The Rolex Datejust 31 ref. 178278-0136 features a lug width of 16mm. This measurement is specific to the 31mm case diameter and determines the correct strap selection. Before purchasing a replacement strap, it is advisable to verify the lug width using a digital calliper positioned between the two lugs, close to the case.

For an 18-carat yellow gold case, the most appropriate materials are vegetable-tanned alligator leather — which develops a genuine patina over time — and polished box-calf in burgundy, cognac or black. Shell cordovan is a technically superior alternative for those seeking greater resistance to wear. A yellow gold deployant clasp completes the pairing with consistent metallic coherence.

To replace the original bracelet or strap, a spring bar tool is required to remove the spring bars securing the strap to the lugs. Care must be taken not to scratch the yellow gold case. It is recommended to rest the watch on a soft cloth and use proper watchmaking-grade tools. Alternatively, any watchmaker or specialist atelier can perform the swap in a matter of minutes.

Yes. The aftermarket offers 16mm straps compatible with the Datejust 31, crafted in leather, NATO nylon, rubber and exotic materials. Compatibility is determined solely by lug width (16mm) and spring bar length. Milanostraps.it offers a curated selection of handcrafted 16mm straps specifically filtered for this model, with bespoke customisation options available through the Casati Milano atelier.

The longevity of a leather strap depends on the quality of the hide, frequency of wear and exposure conditions. A high-grade vegetable-tanned alligator strap, worn daily with proper care — avoiding prolonged contact with water and perspiration — typically lasts between 2 and 4 years before showing structural wear. Box-calf has a comparable lifespan. Shell cordovan, owing to its dense fibre structure, tends to last considerably longer while developing a distinctive patina. Storing the strap in a case when not worn significantly extends its service life.