Strap for Datejust 31 Stainless Steel Domed Diamond / Jubilee / Pink

The lug width (ansa width) of the Rolex Datejust 31 reference 178344-0043 is 16 millimetres. This measurement represents the perpendicular distance between the two lugs of the case and is the fundamental parameter for selecting a compatible strap. To measure correctly, position a digital calliper between the two lugs, perpendicular to the case, excluding any protrusions from the crown.

For a Rolex Datejust 31 bi-metal in stainless steel and white gold measuring 31 millimetres, an alligator strap with vegetable tanning represents the most balanced solution. The natural grain of the leather enhances the bi-metallic contrast, vegetable tanning ensures breathability and patina development over time, and the 16-millimetre proportions adapt perfectly to the contained dimensions of the ladies' case. Recommended colours: black, natural dark brown, or antique beige.

Changing the strap on the Rolex Datejust 31 178344-0043 requires a specific tool: a spring bar remover to avoid damage to the case. Position the watch on a soft surface with the case facing upward, insert the sharp blade of the remover under the spring bar, apply gradual downward pressure until the bar is released from its seat. Repeat for both lugs. The procedure takes approximately 5 minutes and requires no watchmaking expertise.

Yes, any strap with a 16-millimetre lug width is compatible with the Datejust 31 178344-0043. Milano Straps offers a dedicated collection of handcrafted straps in vegetable-tanned alligator, box calf, shell cordovan, and FKM rubber, all available in the 16mm measurement. The straps are supplied with pre-installed stainless steel spring bars, ready for immediate installation.

The durability of a leather strap depends on the material and level of use. A well-maintained vegetable-tanned alligator strap lasts 3-5 years with moderate daily wear; a durable box calf reaches 4-6 years; a premium shell cordovan can exceed 7 years. Longevity increases if the strap is not exposed to prolonged moisture, strong fragrances, or thermal fluctuations. Regular maintenance—cleaning with a soft cloth and occasional application of vegetable conditioner—significantly extends working life.