Strap for Datejust 31 Stainless Steel Domed Diamond / Oyster / MOP - Roman

The Rolex Datejust 31 ref. 178344-0024 has a lug width of 16 mm. This is the internal measurement between the two case lugs and determines the correct strap width for any replacement. Before purchasing an aftermarket strap, it is recommended to verify the measurement with a calliper and to check the spring bar diameter, which for this reference is 1.5 mm.

For the Datejust 31 178344-0024 with a mother-of-pearl dial and white gold bezel, a vegetable-tanned Mississippi alligator strap is the most appropriate choice given the watch's formal register. The square grain of the American alligator complements the fluted bezel geometry. Shell cordovan provides a smooth, lustrous surface that pairs well with the cool tones of white gold, whilst box-calf leather offers a more versatile option for everyday wear.

To replace the strap on a Rolex Datejust 31, the spring bars connecting the strap to the case lugs must be removed. A proper spring bar tool is required for this operation. It is advisable to rest the watch on a soft surface to prevent scratches to the case, carefully lever the spring bar out of the lug, and proceed with the new strap by ensuring both spring bars click securely into the lugs before wearing the watch.

Yes, the aftermarket offers a wide selection of straps compatible with the Rolex Datejust 31 with a 16 mm lug width. Milano Straps and the Casati Milano atelier produce handcrafted straps in alligator, calf leather, shell cordovan and technical materials, with a 16 mm attachment width and bespoke lengths. Each strap is supplied with stainless steel spring bars compatible with the Datejust 31 lugs. The strap ends are shaped to suit the case profile for a precise fit.

The lifespan of a leather strap depends on material quality, frequency of use, and maintenance. A high-quality vegetable-tanned alligator strap, worn in rotation and kept away from prolonged moisture and direct perspiration, can last between three and five years while retaining structural integrity and a refined appearance. Shell cordovan, owing to its dense fibre structure, typically offers above-average durability. Box-calf leather tends to have a shorter average lifespan. Regular application of appropriate leather conditioners significantly extends the strap's life.