Strap for Datejust 31 Stainless Steel Domed Diamond / Jubilee / Grey - Diamond

The lug width of the Rolex Datejust 31 ref. 278344RBR-0008 is 16mm. This measurement is taken internally between the two lugs at the point of strap attachment. It is a non-standard size requiring dedicated straps, ideally with a curved end profile to match the geometry of the Oyster case.

For the Datejust 31 in white gold Rolesor, an alligator strap in vegetable-tanned leather with symmetrical grain is the most coherent choice given the calibre of the case. Shell cordovan is ideal for daily wear, developing a natural patina over time. For aquatic or sports use, a vulcanised rubber strap preserves the Oyster water-resistance rating. In all cases, a 16mm lug width with a curved end is a mandatory technical requirement.

Strap replacement on the Datejust 31 is carried out by removing the spring bars located inside the lugs. A fine-tipped spring bar tool is required to avoid scratching the white gold and steel case. The watch should be placed on a soft surface during the operation. Care must be taken with the Rolesor lugs, which combine two different materials. If in doubt, the procedure can be performed by Casati Milano atelier by appointment.

Yes. Compatible aftermarket straps must conform to the 16mm lug width and, ideally, feature a curved end to follow the Oyster case profile. Milano Straps offers a curated selection of 16mm straps in various materials — alligator, calf leather, shell cordovan, rubber — hand-stitched and fitted with precision buckles. High-end aftermarket straps can match or exceed OEM straps in durability and comfort.

The lifespan of a leather strap depends on the material, care and frequency of use. A quality alligator strap, regularly treated with appropriate conditioners and rotated with other straps, can last 3 to 5 years while retaining structural integrity and patina. Shell cordovan offers superior longevity due to the density of its fibres. Prolonged contact with water, perspiration and perfume accelerates deterioration: for intensive daily use, alternating with a rubber or metal bracelet is recommended.