Strap for Datejust 31 Yellow Gold / Domed / Butterfly / President

The Rolex Datejust 31 reference 278248-0022 has a lug width of 16mm, measured internally between the two lugs of the case. This dimension is specific to the Datejust 31 and differs from the Datejust 36 (20mm) and the Lady-Datejust 28 (13mm). When purchasing an aftermarket strap, it is essential to verify this measurement with a digital calliper before ordering.

For a yellow gold case such as that of the 278248-0022, the most suitable materials are vegetable-tanned alligator — which develops a natural patina over time and complements the warmth of the metal — and shell cordovan for its waxy surface and natural lustre. Smooth vegetable-tanned calf leather offers a more formal and compact alternative. Recommended colour pairings include burgundy, cognac, bottle green or pearl grey, depending on the chosen dial.

Changing the strap on a Rolex Datejust 31 requires a spring bar tool to remove the 1.8mm diameter spring bars securing the strap to the case lugs. Insert the tip of the tool into the lateral groove of the spring bar, compress it and slide the strap free. This operation requires care on a yellow gold case: it is advisable to protect the case with watchmaker's masking tape or entrust the task to a professional to avoid scratching the metal.

Yes. Several artisan manufacturers produce straps with a 16mm attachment compatible with the Datejust 31. It is essential that the strap is built with 1.8mm diameter spring bars and that the lug-end width is exactly 16mm. Milano Straps offers a selection of 16mm straps in various materials — alligator, calf leather, shell cordovan, rubber — with customisable finishing options and a bespoke deployant clasp.

The lifespan of a leather strap depends on the material, tanning method and daily use. A quality vegetable-tanned alligator strap, with regular but non-sporting wear, can last between three and six years whilst retaining its structural and aesthetic integrity, developing a personal patina appreciated by collectors. Shell cordovan is notably more resistant to wear than calf leather. It is recommended to rotate straps seasonally and to avoid prolonged exposure to perspiration, water and direct sunlight.