Rolex Datejust 31 Yellow Gold — Mother-of-Pearl Diamond Dial, Fluted Bezel | Ref. 178238

Reference 178238 represents the full yellow gold expression of the Datejust 31 — a 31 mm Oyster case constructed entirely in 18 ct yellow gold, fitted with a fluted bezel and a mother-of-pearl dial set with diamond hour markers. This configuration stands apart from Rolesor variants by virtue of its monochromatic gold construction, which imparts a cohesiveness and visual weight that two-tone examples cannot replicate. The fluted bezel, one of Rolex's most enduring design signatures, gains particular authority when executed in solid yellow gold, its machined ridges catching light with characteristic brilliance.

Calibre 2235 — the manufacture movement that powered the 31 mm Datejust prior to the introduction of the 2236 — sits within the case, delivering self-winding perpetual movement with Parachrom hairspring and COSC chronometric certification. The Parachrom spiral in niobium-zirconium alloy provides robust resistance to magnetic perturbation, and the bidirectional Perpetual rotor maintains the mainspring's reserve under normal wrist activity. The mother-of-pearl dial, with its organic iridescence, creates a pronounced contrast with the warm metal surround — a pairing that has defined aspirational Rolex femininity across multiple decades.

All-gold Datejust references occupy a distinct segment of the collector market, valued both as horological objects and as stores of precious metal. Reference 178238 is a transitional-generation piece — no longer in current production — which lends it a degree of scarcity not shared by its 278xxx successors. Collectors who prefer the proportions of the earlier Datejust 31 case, or who seek a fully precious-metal dress watch with proven long-term reliability, will find this reference consistently rewarding. Secondary market pricing reflects the combined premium of 18 ct yellow gold construction and gem-set dial.