Like All Rolex watches, the Oyster Perpetual Datejust 31 is covered from the Superlative Chronometer certification redefined by Rolex in 2015. This designation testifies that each watch leaving the brand’s workshops has successfully gone through a series of checks done by Rolex in its very own laboratories As outlined by https://www.watchesworld.com/11-of-the-best-womens-watches/