Rolex Datejust 31 mm

The Rolex Datejust 31 mm, reference 278243-0022, comes in a 31 mm case of steel and gold. The case has a domed bezel and a screw-down crown, and the dark grey dial is set with diamonds. A Cyclops lens sits over the date on the scratch-resistant sapphire crystal. Inside is the self-winding calibre 2236, a chronometer with a power reserve of approximately 55 hours. Central seconds and an instantaneous date round out the display functions. The steel and gold bracelet closes with a concealed folding Crownclasp. Rolex rates the case to 100 metres of water resistance.