Strap for Datejust 31 Stainless Steel Domed Diamond / Oyster / Silver

The Rolex Datejust 31 ref. 278344RBR-0013 has a lug width of 16 mm. This is the standard measurement for the entire Datejust 31 family and should be measured internally between the two lugs using a digital calliper, excluding the lug thickness itself.

For a Datejust 31 with a diamond-set bezel, a belly-grain alligator strap — in black, midnight blue or cognac — is the most coherent choice given the formal character of the dial. Shell cordovan is an alternative for those seeking patina and surface density. For daily wear, a vegetable-tanned calf strap offers superior comfort and breathability.

Strap replacement requires a double-tip spring bar tool to remove the spring bars connecting the strap to the lugs. It is advisable to work on a soft surface to avoid scratching the white gold case. Casati Milano also offers an in-atelier fitting service by appointment.

Yes. Aftermarket straps with a 16 mm attachment are fully compatible with the Datejust 31 278344RBR-0013, provided they are fitted with quality spring bars and have the correct end-piece curvature. Milano Straps offers a curated selection of handcrafted 16 mm straps, available online or customisable in the atelier.

Longevity depends on the leather type and conditions of use. A quality alligator strap, kept away from water and excessive perspiration, typically lasts 2–4 years. Shell cordovan, due to its dense fibre structure, tends to last longer whilst developing a distinctive patina. Milano Straps straps carry an 18-month manufacturing defect warranty.