Strap for Datejust 31 Rose Gold / Diamond / Butterfly / President

The lug width of the Rolex Datejust 31 278285rbr-0010 is 16 millimetres. This width is specific to the 31-millimetre case diameter models and is determined by the proportional calculation of the lugs relative to the middle case. To verify the measurement, measure the internal distance between the two lug shoulders using a digital calliper.

Alligator remains the supreme choice for this reference. For Everose gold, the most harmonious tones are cognac brown, medium brown, and dark burgundy, which create chromatic continuity with the metal. Alternatively, vegetable-tanned calfskin in cognac or burgundy offers greater longevity and develops a patina that ages beautifully alongside the watch.

Changing the strap requires a springbar tool (specialised pointed instrument with retractable tip) and a delicate surface. Insert the tool's tip into the small lateral notch on the lug, push outward to release it from the case, and withdraw the strap. Repeat on the opposite side. To refit the new 16mm strap, align the lug to the case and press gently until you hear the locking click. If uncertain, consult a certified watchmaker.

No. The Datejust 31 278285rbr-0010 specifically requires a strap with a 16-millimetre lug width. Standard straps in 18mm or 20mm widths do not physically fit the case lugs. You must select a strap calibrated to 16mm, such as the bespoke options available on milanostraps.it in the dedicated collection.

Durability depends on the material and usage. A quality alligator strap, with ordinary care, lasts 3-5 years before requiring replacement. Vegetable-tanned calfskin may last longer (5-7 years) owing to the greater resistance of tannins. Replacement becomes necessary when the leather loses elasticity, cracks, or the buckle wears. Keep it dry, avoid prolonged sun exposure, and rotating with other straps extends product lifespan.