Strap for Datejust 31 Rose Gold / Fluted / Butterfly / Oyster

The Rolex Datejust 31 ref. 278275-0020 has a lug width of 16mm. This measurement is specific to the 31mm Datejust models and differs from larger references in the same family (19mm for the 36mm case, 20mm for the 41mm). Before purchasing an aftermarket strap, always verify the lug width using a digital calliper at the narrowest point between the lugs.

On the 18-carat Everose gold case of the Datejust 31, natural materials yield the most coherent aesthetic results. A vegetable-tanned alligator strap in deep bordeaux or dark chocolate brown complements the warm tones of the rose gold. Smooth Box calf leather suits those who prefer understated elegance, whilst shell cordovan offers daily wear resistance with a compact texture and characteristic waxy sheen. A rose gold deployant clasp completes the combination and significantly extends strap longevity.

The strap on the Rolex Datejust 31 is secured to the lugs via 1.5mm spring bars. Replacement requires a dedicated spring bar tool with a fine forked tip. Compress the spring bar towards the lug to release it from its housing. As the lugs are solid 18-carat gold, it is strongly advisable to work on a soft surface and use quality tools to avoid any scratching of the case.

Yes, a number of artisan manufacturers produce 16mm aftermarket straps compatible with the Rolex Datejust 31 ref. 278275-0020. Key specifications to observe are: 16mm lug width, straight (non-curved) strap ends, an overall length suited to a feminine wrist (typically 160–180mm), and 1.5mm spring bars. Milanostraps.it offers handcrafted leather straps in selected hides specifically for this width, produced at the Casati Milano atelier.

The lifespan of a leather strap depends on the material and frequency of wear. A quality vegetable-tanned alligator strap, kept away from prolonged exposure to sweat and moisture, will typically last 3–5 years with daily use. Smooth Box calf has a comparable lifespan. Shell cordovan, owing to the density of the equine subcutaneous tissue, can exceed 5–7 years. All Casati Milano straps carry an 18-month warranty against manufacturing defects.