Strap for Datejust 31 Rolesor Yellow Diamond / Jubilee / MOP

The lug width of the Rolex Datejust 31 ref. 178383-0008 is 16mm. This measurement is taken with a digital calliper inserted between the two lugs on the case back, recording the inner gap. It is specific to the 31mm case diameter and requires straps with curved ends to fit correctly against the Oyster profile.

For the Datejust 31 with mother-of-pearl dial and yellow Rolesor case, the most suitable materials are vegetable-tanned alligator — which develops a patina that complements the iridescence of the dial — and black or cognac box-calf for a more formal register. A deployant clasp in steel or yellow gold PVD is recommended for aesthetic symmetry with the case and to reduce daily wear on the strap.

Removing the original bracelet or strap from the Datejust 31 requires a dedicated spring bar tool to release the bayonet-style spring bars from the lugs. Given the yellow gold lug surfaces, the operation is best entrusted to a watchmaker or a specialist atelier such as Casati Milano to avoid scratching the case.

Yes. Compatible aftermarket straps must have a 16mm lug width with curved ends to match the Oyster case profile. Milano Straps offers a curated selection of handcrafted 16mm straps in various materials, manufactured to precise dimensions to ensure correct fitment without altering the original lugs.

The lifespan of a leather strap depends on material, frequency of wear and maintenance. A quality vegetable-tanned alligator strap, kept away from prolonged water exposure and treated periodically with appropriate conditioners, can last between three and five years while retaining structural integrity. Box-calf offers a similar lifespan but shows surface scratches more readily. Milano Straps provides an 18-month warranty against manufacturing defects.