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