Strap for Datejust 31 Yellow Gold Fluted / Oyster / Black

The Rolex Datejust 31 reference 178278-0106 has a lug width of 16mm. This measurement is specific to the 31mm case variant and differs from the 20mm lug width found on the Datejust 36 or 41. For a precise fit, the strap should feature curved ends compatible with the Oyster-style lugs in 18-carat yellow gold.

For an 18-carat yellow gold case, an alligator strap in cognac or havana tones is the most coherent choice with traditional haute horlogerie aesthetics, as the three-dimensional grain interacts beautifully with the warm light of the gold. Alternatively, vegetable-tanned calf leather or shell cordovan offer refined textures with noble ageing characteristics. For sport use, vulcanised rubber provides water resistance without compromising elegance.

To remove the original bracelet or strap from the Datejust 31, a 1.8mm spring bar tool is required. Insert the tool into the lug notches to compress the spring bars and release the strap. Care must be taken to avoid scratching the yellow gold lugs; it is advisable to protect the case with adhesive tape or to entrust the operation to a watchmaker or the Casati Milano atelier.

Yes. Aftermarket straps must measure 16mm at the lug end and ideally feature curved ends to suit the Oyster lug geometry. Milano Straps offers a curated selection of 16mm straps in alligator, calf leather, shell cordovan, NATO fabric, and rubber, all handcrafted and compatible with this reference. Buckles and deployant clasps are available in stainless steel or gold-plated finish to match the yellow gold case.

The lifespan of a leather strap depends on tanning quality, daily wear conditions, and maintenance. A high-grade alligator or shell cordovan strap, kept away from excessive moisture and perspiration and stored properly, can last between three and seven years whilst retaining excellent condition. Casati Milano straps carry an 18-month warranty against manufacturing defects. Rotating between two straps significantly extends the life of both.