Rolex Datejust 31 Yellow Rolesor — Mother-of-Pearl Roman Dial | Ref. 178243

The Datejust 31 occupies an important intermediate position in Rolex's sizing architecture — larger than the Lady-Datejust 28 yet retaining the dressy proportions that distinguish it from the full 36mm reference. This example, reference 178243 in Yellow Rolesor — Oystersteel complemented by 18ct yellow gold accents — is finished with a domed yellow gold bezel and a mother-of-pearl dial bearing Roman numeral chapter markers in polished gold. The combination of iridescent dial material, classical numerals, and warm yellow gold tones positions this watch firmly within the tradition of the great dress references of twentieth-century Swiss horology.

Mother-of-pearl, harvested from the inner nacre layer of molluscs, is among the most demanding dial materials to work with: each blank is unique in its play of colour, requiring careful selection to ensure visual consistency across a production run. The domed 18ct yellow gold bezel introduces a three-dimensional quality to the case architecture that the flat fluted and diamond bezels of sibling references do not provide, catching the light along its curved profile in a manner that rewards close observation. The screw-down caseback and Twinlock crown deliver water resistance to 100 metres, while the Calibre 2235 self-winding movement within provides reliable, chronometer-certified precision.

The Yellow Rolesor Jubilee bracelet — five-piece links alternating steel and yellow gold in the pattern Rolex introduced alongside the original 1945 Datejust — provides a wrist presence that is at once lighter and more intricate than the Oyster alternative. The folding Oysterclasp with Easylink comfort extension ensures secure, adjustable wear. For the collector seeking a 31mm dress watch of genuine horological pedigree and timeless aesthetic credentials, reference 178243 delivers on every count.