Strap for Datejust 31 Rolesor Yellow Fluted Diamond / Jubilee / Black Diamond

The Rolex Datejust 31 ref. 178313-0021 has a lug width of 16mm. This measurement refers to the internal distance between the two lugs at the 6 o'clock side and is the key specification for selecting a compatible aftermarket strap. The strap ends must feature the appropriate curved profile to sit flush against the 31mm Rolesor yellow case.

For the Datejust 31 178313-0021 in steel and yellow gold, an alligator strap in cognac or honey tones complements the warmth of the Rolesor case. Box-grain calf leather in burgundy or navy blue offers a more formal alternative. For sporting use, vulcanised rubber ensures full water resistance without compromising aesthetics. All straps must feature curved ends sized at 16mm for a proper fit.

To replace the strap on the Datejust 31, you will need a double-ended springbar tool. Insert the fine tip into the small notch between the lug and the strap, compress the springbar inward and slide the strap free. Take care not to scratch the lug surfaces. It is advisable to rest the watch face-down on a soft cloth and work both sides before removing the strap entirely.

Yes. Several artisan manufacturers, including Casati Milano via milanostraps.it, produce aftermarket straps specifically designed for the Datejust 31 with a 16mm lug width and the correct curved ends. Compatibility depends solely on the lug width (16mm) and the curved end profile; no modification to the case is required. Straps are available in alligator, calf leather, shell cordovan, rubber and NATO textile.

The lifespan of a leather strap on the Datejust 31 depends on the leather type, frequency of wear and level of care. A high-quality alligator or vegetable-tanned calf strap, worn regularly on rotation, typically lasts between two and four years. Avoiding prolonged contact with water and perspiration significantly extends the strap's life. Casati Milano provides an 18-month guarantee against manufacturing defects.