The Rolex Lady-Datejust 28 is a slightly larger version of the classic ladies Datejust, which was introduced at BaselWorld 2015 - initially in precious metals only. Its 'Oyster' case measures 28mm across and houses the 'Perpetual' caliber 2236. Two-tone 'Rolesor' and full stainless steel versions would be introduced in subsequent years.
This self-winding mechanical movement with date display is entirely manufactured by Rolex and inaugurates a new generation of movements. Its design and quality manufacture ensure peerless precision and reliability. Like all Rolex Perpetual movements, the 2236 is a certified Swiss chronometer, a designation reserved for high-precision watches that have successfully passed the Swiss Official Chronometer Testing Institute (COSC) tests. It was first introduced in 2014. It the first movement to be fitted with the Syloxi (silicon) hairspring.