Rolex Datejust 31 mm

Rolex Datejust 31 mm, reference 278344RBR-0018, cases in steel and gold at 31 mm. The domed bezel is diamond-set, and the dark grey dial sits under a scratch-resistant sapphire crystal with a Cyclops lens over the date. Inside is the self-winding calibre 2236, a chronometer with a power reserve of approximately 55 hours. Hands and indices are luminous, and the dial keeps a central seconds display alongside the date. The watch is set with diamonds. A steel bracelet closes with a concealed folding Crownclasp in steel and gold. The screw-down crown, part of the Twinlock system, helps keep the case waterproof to 100 metres.