Strap for Datejust 31 Stainless Steel Domed Diamond / Oyster / Black

The lug width of the Rolex Datejust 31 178344-0057 is 16 millimetres. This dimension is measured as the space between the internal spring bars. Straps designed for 16mm are compatible with this model and fit without lateral play.

For the Datejust 31 in white gold and steel, we recommend black alligator, vegetable-tanned calf in cognac or dark brown, or shell cordovan in mahogany. Black alligator harmonises with white gold, whilst vegetable-tanned calf develops a natural patina over time. Your choice should reflect your usage occasions and preferred colour palette.

Strap replacement requires a spring bar tool to compress the internal spring mechanism at the lug, thereby releasing the old strap. Insert the new strap into the lugs, ensuring the spring bar is properly seated and the strap shows no lateral movement. If you lack experience, consult a professional watchmaker.

Yes, any strap manufactured for 16mm lug width is compatible with the Datejust 31 178344-0057. Always verify that the internal lug-to-lug measurement is correct before purchase. Bespoke straps from Casati Milano are crafted to order and carry an 18-month guarantee against manufacturing defects.

The lifespan of a leather strap depends on craftsmanship quality and usage patterns. A high-quality alligator or vegetable-tanned calf strap typically lasts 5–8 years with regular daily wear. Leather must be protected from excessive moisture and perspiration. Casati Milano recommends rotating multiple straps to extend the life of each.