Rolex Lady Datejust Oyster Lock Watch. The primary distinguishing factor between this yellow Rolex Datejust and the other two-tone models in the collection is the interior case. Perfectly matching the champagne dial with its appliqué Roman hour markings and black gold hands is the fluted yellow gold bezel. A foldable Oysterlock clasp and an oyster steel yellow gold bracelet ensure a fine, snug fit, especially when submerged. This is the Lady Datejust 178273 Gold Rolex Lady Datejust Oyster Lock Watch. Water resistance up to 100 meters is provided by Reference 178273 Gold’s durable sapphire crystal and Twinlock yellow gold crown. The yellow Rolesor Datejust with caliber 2235 chronometer has been installed by Rolex to guarantee that the highest level of accuracy is maintained even at depth.