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

The lug width (ansa) of the Rolex Datejust 31 reference 178273-0045 is precisely 16 millimetres. This is a specific dimension characteristic of the 31mm Datejust variants. This measurement requires straps manufactured specifically for this width: a 18mm or 20mm strap will not fit the lugs of the case. Always verify compatibility before purchasing any aftermarket strap.

For the Datejust 31 in two-tone steel and gold, we recommend alligator or premium calf leather. Alligator complements the luxury nature of the two-tone case, offering natural grip and a patina that improves with time. If you prefer versatility, vegetable-tanned calf with discrete finishes (dark brown, black or burgundy) provides daily comfort without aesthetic compromise. For sporty or casual use, a canvas NATO in sand tone maintains impeccable proportions on the 31mm case.

The Datejust 31 features straight lugs without articulation: the strap is fitted into the lugs via spring bars. Removal requires a specific tool (spring bar tool) to compress the pin and extract the old strap. This procedure demands precision—improper execution could result in the strap falling from the wrist. We recommend having the change performed by an authorised Rolex service centre or a specialised craftsman such as Casati Milano, where the work is guaranteed and documented.

Yes, provided it respects the 16mm lug width and proportions suitable for the 31mm dial. Aftermarket straps of artisanal quality (leather, rubber, NATO) are fully compatible if manufactured for this width. Caution: inexpensive synthetic leather straps age poorly and compromise the aesthetic value of a watch of this calibre. With Casati Milano, you select the leather directly at the Milan atelier and follow every stage of craftsmanship.

A quality leather strap (alligator, vegetable-tanned calf, shell cordovan) typically lasts 3–5 years of daily wear, varying with exposure to sunlight, perspiration and humidity. Alligator ages better than calf, developing a sought-after patina. A shell cordovan strap can exceed 5–6 years before showing significant wear. Casati Milano straps include an 18-month warranty against manufacturing defects and can be reconditioned (re-tanning or buckle replacement) without requiring complete replacement.