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 every watch leaving the model’s workshops has effectively undergone a number of assessments done by Rolex in its individual laboratories Based on its own criteria, https://www.watchesworld.com/11-of-the-best-womens-watches/