Strap for Datejust 31 Yellow Gold / Fluted / Silver - Diamond / President

The Rolex Datejust 31 ref. 278278-0034 has a lug width of 16mm. This measurement is specific to the 31mm case size and differs from the 36mm variant (20mm) or the Lady-Datejust 28mm. Always verify the internal distance between the lugs with a digital calliper before ordering a replacement strap.

For the 18-carat yellow gold version, a vegetable-tanned alligator belly strap in cognac, bordeaux or forest green offers the finest aesthetic balance. Smooth calfskin leather develops a personal patina over time. For intensive daily use or water exposure, vulcanised rubber provides durability and water resistance without compromising appearance.

Strap replacement requires a fine-tipped spring bar tool. Insert the tip into the spring bar slot between the lug and the strap end, compress the spring bar and slide it out laterally. This is a reversible procedure that does not require a Rolex service centre, though it is advisable to follow guidance from your strap supplier or a qualified watchmaker to avoid scratching the case.

Yes. The aftermarket offers 16mm straps compatible with standard 1.5mm spring bars. Milano Straps supplies handcrafted straps with straight or curved ends specifically designed for the Datejust 31 lug geometry. It is essential to confirm the correct total length — standard or short — based on your wrist circumference.

A quality leather strap — alligator or vegetable-tanned calfskin — typically lasts 18 to 36 months under daily wear, depending on exposure to perspiration, humidity and cosmetic products. Casati Milano straps carry an 18-month manufacturing defect warranty. Regular conditioning with a neutral leather cream significantly extends the lifespan of the strap.