Strap for Datejust 31 Stainless Steel / Yellow Gold / Domed - Diamond / Olive - Roman / Jubilee

The lug width (also called lug distance or ansa width) of the Datejust 31 is 16 millimetres. This dimension is specific to Datejust 31 models and differs from the larger male Datejust 36, which features 20-millimetre lugs. A compatible strap should have a base width between 15.8 and 16.2 millimetres to ensure a secure fit without excessive play or risk of damage.

Polished black alligator remains the most formal choice, cohesive with the diamond-set bezel, as its homogeneous grain and smooth surface amplify the jewellery-like quality of the case. Vegetable-tanned calf leather offers a versatile and more accessible alternative, with a patina that improves over time. For casual contexts, a Navy or grey FKM rubber strap maintains the dignity of the timepiece with daily practicality.

Strap removal requires a spring bar tool to detach the lugs from the lateral spring-bar mechanisms. Place the watch on a soft surface, locate the small openings at the lug ends, gently push inward with the tool to compress the spring, and extract the lug. Repeat on the opposite side. To install a new strap, insert the lugs into the strap holes and press until the spring mechanism clicks into place. If unfamiliar with this procedure, consult a Rolex service centre or qualified watchmaker.

Yes, aftermarket straps may be used provided they meet the 16-millimetre lug width specification. However, quality will vary considerably: hand-crafted leather straps in alligator or vegetable-tanned calf will offer superior longevity and aesthetic beauty compared to industrial products. Always verify technical specifications and tanning certifications before purchase.

Durability depends on material, tanning method, and usage patterns. A high-quality alligator strap lasts 4–6 years with daily wear. Vegetable-tanned calf leather, being softer and more prone to wear, lasts 3–5 years. Longevity increases significantly if the watch is worn intermittently or rotated with multiple straps. Exposure to perspiration, moisture, and sunlight accelerates deterioration: to maximise lifespan, clean regularly and store in a dry environment.