Rolex Datejust 31 mm

Rolex Datejust 31, reference 278289RBR-0017, measures 31 mm in white gold with a diamond-set bezel. The case follows Rolex's Oyster architecture, with a monobloc middle case and a screw-down winding crown. A scratch-resistant sapphire crystal with a Cyclops lens sits over the date, magnifying it against the dark grey dial. Inside is the calibre 2236, a self-winding mechanical movement certified as a Superlative Chronometer, with a power reserve of about 55 hours. The watch is set with diamonds and combines central seconds with a date function. It is fitted on a President bracelet in white gold, closed with a concealed folding Crownclasp. Rolex rates the case to 100 metres.