Rolex
Datejust 31 178278-0025— lug 16mm

The Rolex Datejust 31 reference 178278-0025 features a lug width of 16mm. This measurement refers to the internal distance between the two case lugs and is the essential parameter for selecting a compatible strap. It is not interchangeable with the 20mm lug width found on male Datejust models.

For an 18k yellow gold case, an alligator strap with Hornback grain in warm tones — tobacco, burgundy, or cognac — offers the most coherent aesthetic pairing. Alternatively, a vegetable-tanned calfskin strap develops a distinguished patina over time, well suited to daily wear. For humid or sporting environments, vulcanised rubber remains the most practical choice.

The strap is removed using a springbar tool, inserted into the lateral hole of the lug to release the spring bars. The operation takes only a few minutes with the correct tools. It is advisable to consult a trusted watchmaker to avoid scratching the yellow gold case, which is more susceptible to surface marks than stainless steel.

Yes. The aftermarket offers 16mm straps compatible with this reference, produced by artisan ateliers such as Casati Milano. Compatibility depends solely on the lug width (16mm) and standard spring bar attachment. A bespoke handcrafted strap can match or exceed original Rolex accessories in terms of materials and finishing quality.

Longevity depends on the material and frequency of use. A high-quality alligator strap, worn in rotation, can last between 3 and 7 years while retaining its shape and appearance. Vegetable-tanned calfskin develops patina and typically lasts 2 to 5 years. Shell cordovan is the most durable of all leather types, with a life expectancy exceeding 5 to 8 years. Constant humidity and contact with perfume accelerate deterioration in any leather strap.