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 manufacturer’s workshops has effectively been through a series of tests executed by Rolex in its have laboratories As outlined by https://www.watchesworld.com/11-of-the-best-womens-watches/