Like All Rolex watches, the Oyster Perpetual Datejust 31 is covered by the Superlative Chronometer certification redefined by Rolex in 2015. This designation testifies that each watch leaving the brand name’s workshops has properly been through a number of checks executed by Rolex in its individual laboratories As outlined by https://www.watchesworld.com/11-of-the-best-womens-watches/