Strap for Datejust 31 Stainless Steel Diamond / Oyster / Grey - Roman

The lug width of the Rolex Datejust 31 278384rbr-0031 is 16 mm. This dimension is specific to the Datejust 31 and is not compatible with standard 18 mm or 20 mm straps. To verify the measurement, measure the inner distance between the lugs from the outer attachment point on the left to the outer attachment point on the right.

Alligator is the optimal choice for the 278384rbr-0031: its minimal grain and natural patina harmonise perfectly with the white gold case. Alternatively, vegetable-tanned calf offers more pronounced texture and tactile softness, whilst shell cordovan provides hardness and brilliance with predictable ageing. Avoid: oversaturated colours or overly casual materials.

The change requires a specific tool (spring bar tool). Remove the pin connecting the lug to the case by pressing it slightly downwards, then extract the old strap. Insert the new strap by aligning the lugs with the attachment holes, press until you feel the spring mechanism click. If you are not experienced, consult an official Rolex service centre or a specialist watchmaker.

Yes, provided the strap is specifically sized for 16 mm lugs. Quality aftermarket straps respect millimetric tolerances and guarantee stability and aesthetics. Always verify that the manufacturer explicitly certifies compatibility with reference 278384rbr-0031 and that the strap is made from noble materials (alligator, calf, cordovan) to maintain the formal harmony of the watch.

A noble leather strap (alligator, shell cordovan) typically lasts 3–5 years with daily wear, depending on frequency of use, climate and maintenance. Alligator ages beautifully and develops patina; cordovan requires protection from extreme humidity. To extend useful life, rotate at least 2–3 straps and store them in dry environments. A reconditioning service can extend the lifespan by a further 2–3 years.