Rolex Datejust 79178

The Reference 79178 denotes the 26mm Lady-Datejust model from the 79xxx series, produced in solid 18k yellow gold. Its technical configuration is specified by the final digits: 17 for the classic fluted bezel and 8 for the material. This model represents the technical evolution from the preceding 69178, primarily through the integration of the Rolex Caliber 2235, a 31-jewel automatic movement with a 48-hour power reserve operating at 28,800 vph. The case architecture is the 26mm Oyster, water-resistant to 100 meters via a Twinlock screw-down crown and monobloc middle case. Historically, this reference is significant as the archetypal solid-gold ladies’ Rolex of its era (c. 1999-2005), combining iconic design with modern mechanical performance before the transition to the heavier six-digit reference cases.