Strap for Datejust 31 Rolesor Yellow Diamond / Jubilee / Champagne Floral

The Rolex Datejust 31 reference 178383-0006 has a lug width of 16mm. This measurement refers to the internal distance between the two lower case lugs where the strap is fitted. It is important not to confuse this with the lug width of the Datejust 36mm (20mm) or 28mm (13mm) models. A 16mm strap ensures a correct and tailored fit without placing undue stress on the case.

For the Datejust 31 178383-0006 in Rolesor (steel and yellow gold), a vegetable-tanned alligator strap is the most coherent choice for its dressy character. Cognac and bordeaux shades complement the warmth of the yellow gold, while gloss black offers the greatest versatility. Shell cordovan is an excellent alternative for those who prefer a more uniform surface with a patina that evolves over time. For casual or sportive wear, smooth calf leather and FKM rubber are both sound options.

To replace the strap on a Rolex Datejust 31, you will need a springbar tool or a suitable watchmaker's screwdriver to release the spring bars securing the strap to the lugs. Work on a soft surface to avoid scratching the case. The Datejust 31 lugs have a slight curve that requires pre-curved strap ends for an optimal fit. If in doubt, it is advisable to consult a qualified watchmaker or the Casati Milano atelier.

Yes, there is a wide range of high-quality aftermarket straps compatible with the Rolex Datejust 31 178383-0006. The key specification is the 16mm lug width. Milano Straps and the Casati Milano atelier craft bespoke straps in alligator, shell cordovan, calf leather and FKM rubber, all dimensioned precisely for this lug width. The quality of the materials and the accuracy of the pre-curved ends determine the final aesthetic result on the wrist.

The longevity of a leather strap depends primarily on the quality of the material, the tanning method, and the intensity of use. A high-quality vegetable-tanned alligator strap, worn with care and rotated with other straps, can last between three and five years while maintaining its structure. Shell cordovan, owing to the density of its fibres, is among the most durable materials available. It is advisable to avoid prolonged contact with water and perspiration, and to apply a specialist leather conditioner periodically.