Strap for Datejust 31 Rolesor Yellow Fluted / Jubilee / Black Diamond

The Rolex Datejust 31 ref. 178273-0020 has a lug width of 16mm. This measurement should be taken with a calliper across the internal distance between the lugs, as other references within the Datejust family may differ. It is a non-standard size requiring straps specifically made or selected for a 16mm attachment.

For the Datejust 31 178273-0020 in Rolesor (steel and yellow gold), the most suitable options are polished alligator leather in black or burgundy for a formal register, vegetable-tanned calf leather for daily wear with an evolving patina, and shell cordovan in warm tones such as cognac or dark brown for maximum longevity and grain depth. A deployant clasp in steel or yellow gold completes the pairing with the case's metal components.

Replacing the strap on the Datejust 31 requires a dedicated springbar tool or a lug-tipped lever with a protected tip to avoid scratching the yellow gold lugs. The 16mm springbars are removed by carefully compressing the spring-loaded ends. It is advisable to work on a soft watchmaker's pad and, if in doubt, to entrust the procedure to a watchmaker or the Casati Milano atelier.

Yes, high-quality aftermarket straps compatible with the Datejust 31 178273-0020 are available. The key parameter is the 16mm lug width. Milano Straps offers a selection of handcrafted straps in various materials — alligator, calf, shell cordovan, rubber — supplied with springbars and compatible with the original Rolex lugs, without requiring any adapters.

The lifespan of a leather strap on a Datejust 31 depends on the material and care. A quality vegetable-tanned alligator strap, kept away from water and excessive perspiration and rotated regularly, will maintain its structural and aesthetic integrity for 3 to 5 years. Shell cordovan can exceed 5 years owing to its dense fibre structure. Intensive daily use or exposure to humidity significantly reduces longevity: it is recommended to rotate at least two straps and to avoid wearing the watch during prolonged physical activity.