Strap for Datejust 31 Yellow Gold / Fluted / Black MOP / President

The lug width of the Rolex Datejust 31 ref. 278278-0038 is 16mm. This measurement should be taken with a digital calliper between the two lugs, at the inner channel where the spring bar sits — not across the outer edge of the case. It should not be confused with the 20mm lug width of the Datejust 41 or other variants within the Datejust family.

For an 18-carat yellow gold case, the most suitable materials are vegetable-tanned alligator (hornback or belly cut) and polished box-calf leather. Both complement the warm tone of the gold without overpowering it. A deployant clasp is preferable to a standard pin buckle, as it distributes tension evenly across the strap and preserves its shape over time.

To replace the strap on a Datejust 31, you need to remove the 16mm spring bars connecting the strap to the case lugs. This is done using a dedicated spring bar tool inserted into the small hole on the lug. Care must be taken to avoid scratching the yellow gold case: using a protective pad is strongly recommended, and it is advisable to have the operation carried out by a watchmaker or specialist atelier.

Yes. The Datejust 31 accepts any aftermarket strap with a 16mm attachment and standard spring bars. Milano Straps offers a curated selection of handcrafted 16mm straps in alligator, calf leather, shell cordovan and fabric, all made with shaped ends to follow the curvature of the Oyster case. An original Rolex bracelet is not required to achieve a precise and secure fit.

The lifespan of a leather strap depends on the material, frequency of use and maintenance. A quality vegetable-tanned alligator strap, rotated with other straps, can last between three and six years while retaining good structural integrity. Prolonged exposure to water and perspiration accelerates deterioration: it is advisable to avoid wearing it in humid conditions and to condition the leather periodically with silicone-free products.