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Rolex · Datejust 31

Strap for Datejust 31 Stainless Steel Diamond / Oyster / Green

Takes 16 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

16mm
16 mm strapsAll Rolex
Lug width16 mm
Case diameter31 mm
Reference278384rbr-0021
FamilyDatejust 31
MovementRolex caliber 2236 Hours, Minutes, Seconds | Date | Chronometer
CaseWhite Gold, Stainless Steel

Spring bar

Spring bars for Rolex

The right category for this model · choose the 16 mm size

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Straps for the Datejust 31 278384rbr-0021

Selected for the 16 mm lug width

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The Datejust 31 278384rbr-0021, seen from the bench

The Rolex Datejust 31 ref. 278384rbr-0021 features a 31mm case in Oystersteel 904L and 18K white gold with a diamond-set white gold bezel. It is powered by the Rolex 2236 automatic movement, COSC-certified chronometer with ±2 seconds per day precision, featuring a Syloxi silicon balance wheel. Water-resistant to 100 metres with Twinlock screw-down crown and date window with Cyclops at 3 o'clock. Lug width is 16mm. The five-link Jubilee bracelet completes this women's watch designed with both jewelry aesthetics and reliable wrist instrument functionality.

Frequently asked questions

What is the lug width of the Rolex Datejust 31 ref. 278384rbr-0021?

The lug width of the Rolex Datejust 31 ref. 278384rbr-0021 is 16 mm. This measurement should be taken with a digital calliper between the two case lugs, flush against the bezel, to ensure a precise fit without lateral play.

What is the best strap for the Rolex Datejust 31 278384rbr-0021?

For a white gold and steel case with a diamond-set bezel, vegetable-tanned alligator leather is the most balanced pairing: the natural scale grain integrates with the bezel texture without overpowering it. Shell cordovan offers a compact, understated surface finish for those who prefer a more restrained aesthetic.

How do you change the strap on a Rolex Datejust 31?

The strap on the Rolex Datejust 31 is removed by releasing the spring bars connecting the bracelet or strap to the case lugs. A professional spring bar tool should be used with care to avoid scratching the white gold lugs. If in doubt, entrust the operation to a qualified watchmaker or the Casati Milano atelier.

Are there aftermarket straps compatible with the Rolex Datejust 31 278384rbr-0021?

Yes. Aftermarket straps measuring 16 mm with Oyster-profile shaped ends are compatible with the Datejust 31. Milanostraps.it offers a selection of handcrafted straps in alligator, calf leather, shell cordovan, NATO webbing and rubber, specifically produced for the 16 mm lug width of this reference.

How long does a leather strap last on a Rolex Datejust 31?

The lifespan of a leather strap depends on leather quality, tanning method and daily use. A handcrafted alligator or shell cordovan strap, maintained regularly and alternated with other straps, retains its structural and aesthetic integrity for 3 to 5 years. Vegetable-tanned leathers develop a personal patina over time, which enhances their character without compromising functionality.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only