Strap for Datejust 31 Stainless Steel Domed Diamond / Oyster / Pink Roman

The lug width (ansa width) of the Rolex Datejust 31 178344-0012 is 16 millimetres. This measurement is determined by the proportions of the 31mm case and the specific construction of the lugs. To verify strap compatibility, measure the internal distance between the spring bars with a digital calliper: it must be exactly 16mm.

The Datejust 31 178344-0012, featuring its two-tone white gold and steel case, pairs exceptionally well with straps in natural alligator (dark shades such as ebony brown or black), vegetable-tanned calf leather that develops patina over time, or shell cordovan with its distinctive texture. For timeless formal elegance, black alligator is recommended; for those who appreciate aesthetic ageing, vegetable-tanned calf is ideal.

Strap replacement requires a specialised tool called a spring bar tool to extract the pins connecting the strap to the case lugs. Position the fine screwdriver in the groove of the pin, push gently inward to release one end, then extract the pin completely. Repeat for the opposite side. The operation demands patience and precision to avoid scratching the case.

Yes, absolutely. Any strap with a compatible 16mm lug width can be fitted to the 178344-0012. Specialised aftermarket brands such as Casati Milano produce bespoke straps in fine leather—alligator, calf, cordovan—that maintain or enhance the elegance of the case. Always verify the lug width with a calliper before purchasing.

A high-quality leather strap, crafted with vegetable tanning and noble materials such as alligator or cordovan, can last between 3 to 7 years with daily use and proper maintenance. Durability depends on exposure to moisture, perspiration, and temperature fluctuations. Regular cleaning with a soft dry cloth and avoiding prolonged contact with salt water significantly extends the strap's lifespan.