The Rolex Lady-Datejust 31mm Black Dial 178240 is a feminine timepiece that combines Rolex’s world-class craftsmanship with elegance and functionality. This watch features a sleek stainless steel Oyster bracelet, a chic black dial, and a sturdy, scratch-resistant sapphire crystal. A perfect blend of performance and sophistication, this Rolex Lady-Datejust is water-resistant up to 100 meters and boasts a power reserve of approximately 42 hours.