Rolex Datejust 31 mm

Rolex Datejust 31 mm, reference 278381RBR-0030, in steel and gold, is a chronometer built on a 31 mm case. The dial is slate, set with diamonds, with a large VI marked out by eleven stones, and sits under a scratch-resistant sapphire crystal with a Cyclops lens over the date. Inside is the calibre 2236, a Perpetual, mechanical, self-winding movement with a power reserve of approximately 55 hours. The bezel is diamond-set, and the screw-down crown carries Rolex's Twinlock double waterproofness system. A Jubilee bracelet in steel and gold, closed with a concealed folding Crownclasp, completes the watch. Date and central seconds round out the functions. The screw-down crown also helps hold the case to its 100 metre rating.