Rolex Datejust Yellow Rolesor — Mother-Of-Pearl Diamond Dial | Ref. 178243

Reference 178243 represents a compelling chapter in the Datejust 31's evolution — a 31 mm Oyster case in Yellow Rolesor combining Oystersteel flanks with 18 ct yellow gold crown, bezel and Jubilee bracelet centre links. The Mother-Of-Pearl dial exhibits that characteristic iridescent shimmer unique to natural shell, its surface alive with shifting colour from translucent white to faint pink and cream depending on the angle of incidence. Factory-set diamond hour markers complete the dial, each stone selected for colour and clarity to Rolex's exacting standards.

The 178243 is equipped with Calibre 2235, the predecessor to the current-generation 2236 that powered the 31 mm Datejust references prior to the introduction of the 278xxx case family. The 2235 incorporates a Parachrom hairspring in Rolex's proprietary niobium-zirconium alloy, resistant to magnetic fields approximately ten times more effectively than a conventional steel spring, and demonstrably more shock-resistant. The movement meets Superlative Chronometer specifications and has decades of proven reliability in the field.

The 178xxx series of Datejust 31 watches occupies an interesting collector position: directly preceding the technical refinements of the 278xxx generation yet sharing the same 31 mm case geometry and Jubilee bracelet proportions. Mother-Of-Pearl dials have long commanded premium attention in Rolex's secondary market — the natural material's inherent variation ensures that no two examples are visually identical, rendering each piece genuinely unique. The Yellow Rolesor configuration frames the luminous dial in a way that accentuates its warm undertones, creating a cohesive and highly wearable aesthetic.