Strap for Datejust 31 Rolesor Yellow Domed Diamond / Oyster / Black

The lug width of the Rolex Datejust 31 ref. 178343-0059 is 16 mm. This measurement should be taken with a digital calliper inside the two lugs, at the point where the strap attaches. It is important to verify this before purchasing an aftermarket strap, as 16 mm is less common than the standard 18 mm or 20 mm and requires a specific selection.

For the Datejust 31 in yellow Rolesor, alligator leather or shell cordovan are the most fitting choices given the watch's formal character. Alligator enhances the natural grain and complements the polished surfaces; cordovan offers compactness and everyday durability. A vegetable-tanned calf strap in cognac or bordeaux is the most artisanal option for those who appreciate a patina that evolves over time. The required lug width is 16 mm.

To replace the strap on a Rolex Datejust 31, you will need a spring bar tool to remove the springbars connecting the strap to the lugs. Rest the watch on a soft surface, insert the tool into the small notch on the side of the lug, and gently compress the springbar to release it. Take care not to scratch the gold or steel lugs. If in doubt, it is advisable to consult a watchmaker or the Casati Milano atelier.

Yes, high-quality aftermarket straps compatible with the Rolex Datejust 31 are available, provided they are made to a precise 16 mm lug width. Milano Straps offers a curated selection of handcrafted leather, cordovan and other straps specifically calibrated for 16 mm lugs, produced by the Casati Milano atelier or available ready to purchase online. Buckles or deployant clasps can be supplied in steel or gold-tone to match the Rolesor case.

The lifespan of a leather strap depends on the type of hide, frequency of wear and care given to the material. A quality alligator strap worn daily typically lasts between 2 and 4 years; shell cordovan, thanks to its dense, non-porous structure, tends to last longer and develops a distinguished patina. Casati Milano straps carry an 18-month guarantee against manufacturing defects. To extend strap life, avoid prolonged exposure to water and perspiration, and rotate between multiple straps.