Rolex Datejust 31 White Rolesor — Silver Diamond Dial with Domed Diamond Bezel | Ref. 278344RBR

Ref. 278344RBR is a jewellery-intensive expression of the Datejust 31: White Rolesor construction paired with a domed 24-diamond bezel — a more sculptural profile than the traditional flat fluted form — and a silver dial set entirely with diamond hour markers. The "RBR" suffix in the reference designation denotes the factory-set diamond bezel, a Rolex practice that distinguishes genuine factory gem-setting from aftermarket modifications and carries direct implications for authentication, warranty, and long-term value retention. The domed bezel profile imparts a softly convex silhouette that sits with particular elegance on the wrist.

The 278xxx prefix places this watch within the current-generation Datejust 31 series, housing Calibre 2236 — Rolex's advanced self-winding calibre featuring the proprietary silicon Syloxi hairspring. The Syloxi's inherent resistance to magnetic interference and thermal variation enhances long-term rate stability markedly over earlier hairspring alloys. Running at 28,800 vph with Paraflex shock absorption and certified to Superlative Chronometer standards (-2/+2 seconds per day), the 2236 represents the state of the art in this case diameter. Water resistance reaches 100 metres via the screw-down Twinlock crown.

For collectors focused on diamond-set contemporary Datejust references, the 278344RBR offers a particularly coherent set of attributes: factory RBR diamond bezel, current-generation movement, and silver diamond dial in a versatile White Rolesor case. The 278xxx generation has only been in production since 2018, meaning available examples are relatively recent; pre-owned pieces in excellent condition with original box and papers are especially sought after, as complete-set provenance commands a clear premium in this jewellery-watch segment.