Strap for Datejust 31 White Gold Diamond / Jubilee Diamond / Black MOP

The Rolex Datejust 31 ref. 178159-0039 features a lug width of 16mm. This measurement is taken with a digital calliper at the internal distance between the two lugs on the 6 o'clock side. Using straps specifically sized at 16mm is essential to ensure a proper fit and to avoid damaging the 18-carat white gold lugs.

For a white gold case measuring 31mm in diameter, a Porosus alligator strap in dark brown or midnight blue represents the most coherent aesthetic pairing: the symmetrical grain and gloss finish complement the luminosity of the precious metal. Alternatively, a vegetable-tanned calf leather strap with a smooth finish develops a refined patina over time and suits daily wear. A deployant clasp in white gold or silver PVD completes the combination with consistent metal tones.

Replacing the strap on the Datejust 31 requires a spring bar tool suited to push-pin style spring bars. The white gold lugs are particularly delicate: a tool with a nylon-tipped fork is strongly recommended to avoid scratching the metal surface. Alternatively, the operation can be carried out by a watchmaker or at the Casati Milano atelier during the fitting of a bespoke strap.

Yes. The Datejust 31 ref. 178159-0039 accepts any aftermarket strap with a 16mm attachment, provided the strap ends are shaped to match the curvature of the Rolex lugs. Casati Milano crafts bespoke artisan straps calibrated to the exact dimensional specifications of this model, also available ready-to-ship online in the 16mm strap collection.

The lifespan of a leather strap depends on the material and conditions of use. A quality alligator strap, with moderate daily wear and proper care (kept away from water and perfumes), typically lasts between 2 and 4 years. Vegetable-tanned calf leather develops character over time and can last even longer when rotated with other straps. Casati Milano provides an 18-month warranty against manufacturing defects on all artisan straps.