Strap for Day-Date 36 White Gold Diamonds / President / Black Diamond

The lug width of the Rolex Day-Date 36 118389-0013 is 20 millimetres. This measurement must be taken from the inner edge of one lug to the inner edge of the other, measured in a straight line and excluding the spring bar tube. Accurate measurement is essential before purchasing an aftermarket strap, as the Day-Date 36 does not tolerate construction compromises.

For the Day-Date 36 in 18-carat white gold, we recommend vegetable-tanned alligator leather in dark brown, aniline calf, or shell cordovan. Alligator offers visible grain texture that harmonises elegantly with the nobility of white gold, whilst shell cordovan ensures exceptional durability and rich patina development over time. Aniline calf represents the choice for those seeking tactile softness and natural ageing characteristics.

Strap replacement requires access to the spring bars—the two horizontal suspension pins at the case extremities. Using a spring bar tool or dedicated precision tool, press the outer pin to release the internal spring, then carefully withdraw the old strap. Insert the new strap, aligning it perfectly with the pin seats, ensuring both bars click into position securely. If you lack appropriate tools, strap changes are recommended at an authorised Rolex dealer or specialist atelier.

Yes, quality aftermarket straps are fully compatible with the Day-Date 36 118389-0013, provided they respect the 20-millimetre lug width specification. Specialised strap manufacturers offer certified compatibility with this model. Selecting experienced providers guarantees construction quality, appropriate finishing, and durability comparable to original Rolex straps.

Leather strap longevity depends on material and usage patterns. With alligator vegetable-tanned or shell cordovan, with ordinary maintenance (avoiding excessive moisture and regular cleaning), durability ranges from 4 to 8 years. With aniline calf, durability typically spans 3 to 5 years. A production defect warranty (18 months at Casati Milano) covers any construction non-conformity. Natural patina development over time is a desired characteristic, not a defect.