Strap for Day-Date 36 Yellow Gold Diamonds / President / Black Diamonds Rubies

The Rolex Day-Date 36 model 118348-0148 is equipped with lugs (lug width) of 20 millimetres. This measurement is specific to this model and represents the internal distance between the two lugs of the case. It is essential to verify this dimension before purchasing an aftermarket strap, as an incorrect size would result in aesthetic misalignment and instability during wear. The correct measurement is taken with a digital calliper by measuring the distance between the flat ends of the lugs.

For a Rolex Day-Date 36 118348-0148 in 18k yellow gold, the most recommended materials are: superior grade alligator (with regular grain and patina that improves over time), calf leather with vegetable tanning (which develops richer tones), shell cordovan for an almost metallic texture, and technical solutions such as FKM rubber for more informal contexts. Yellow gold requires noble materials that reflect the watchmaking quality of the timepiece. A low-quality strap would compromise the overall aesthetics and the investment in the watch.

Changing the strap on a Rolex Day-Date 36 requires the use of a specific tool called a spring bar tool. You must carefully remove the retaining pins (spring bar) from the case lugs to avoid scratches. It is advisable to work on a soft surface (microfibre) and proceed with caution, especially on gold watches. To avoid risks, you may entrust the operation to a specialist or a bespoke atelier such as Casati Milano, which follows the entire replacement phase with millimetric expertise.

Yes, quality aftermarket straps are fully compatible with the Day-Date 36 118348-0148, provided they respect the 20-millimetre lug width specification. Compatibility is guaranteed by the technical specification of the lug width, not by the brand of the strap. However, it is essential to choose straps made with materials and finishes that reflect the quality of the watch itself. Artisanal leather straps made with carefully selected materials and traditional techniques ensure superior durability and aesthetics compared to inexpensive industrial productions.

The lifespan of a leather strap on a Day-Date 36 depends heavily on the quality of the material and its use. An artisanal leather strap of superior quality (alligator, vegetable-tanned calf, cordovan) can last 5–10 years under regular wear and with proper maintenance. Factors such as exposure to moisture, perspiration, and temperature variations accelerate ageing. A synthetic leather strap of poor quality has a much shorter lifespan, often 1–2 years. Straps manufactured at the Casati Milano atelier include an 18-month guarantee against production defects and are built to last thanks to meticulous material selection and artisanal craftsmanship.