Strap for Datejust 31 White Gold Diamond / President / Meteorite

The lug width of the Rolex Datejust 31 ref. 178159-0021 is 16mm. This measurement is taken on the inside of the lugs using a digital calliper placed at the spring bar attachment point. It should not be confused with the overall case width. Only the internal lug measurement determines strap compatibility.

For an 18kt white gold case such as that of the Datejust 31 178159-0021, a vegetable-tanned alligator strap is the most coherent choice for the dressy register of the watch. The symmetrical belly grain of alligator leather complements the polished finish of white gold. Alternatively, shell cordovan in neutral tones — grey, burgundy, midnight blue — develops a refined patina over time. For casual wear, vulcanised rubber is technically appropriate and visually light.

To replace the strap on a Rolex Datejust 31, a spring bar tool is required. Insert the forked tip into the lug hole, compress the spring bar and slide the strap free. Given the white gold case, it is advisable to use PTFE tape on the lugs to prevent scratching. If you are unfamiliar with the procedure, a watchmaker or a specialist atelier such as Casati Milano can carry out the swap safely.

Yes, high-quality aftermarket straps compatible with the Rolex Datejust 31 178159-0021 are widely available. The standard 16mm lug width is supported by many independent craftsmen and specialist manufacturers. Milano Straps offers straps in alligator, shell cordovan, calfskin and rubber, made to order or selected for direct compatibility with this reference. Fitting an aftermarket strap does not affect the Rolex manufacturer's warranty, as no intervention on the movement is involved.

The lifespan of a leather strap on a Rolex Datejust 31 depends on the material, tanning method and daily use. A vegetable-tanned alligator strap, kept away from water, perspiration and sunscreen, can last between three and five years with regular wear. Shell cordovan tends to last longer due to the dense, compact fibre structure. Milano Straps provides an 18-month guarantee against manufacturing defects. Rotating between two straps is recommended to extend the useful life of each.