Rolex Datejust 31 White Gold — Dark MOP Roman Dial, 48-Diamond Bezel | Ref. 178159

Reference 178159 represents the Datejust 31 at its most lavishly appointed: 18 ct white gold throughout, a 48-diamond bezel, and a dark mother-of-pearl dial set with Roman numeral hour markers. The 31 mm case size — long favoured by collectors who find the 28 mm Lady-Datejust too delicate and the 36 mm too assertive — sits in a particularly wearable middle ground. Dark mother-of-pearl, sourced from the inner shell of molluscs, presents a shifting iridescence ranging from deep teal to near-black depending on incident light, a quality impossible to reproduce in any synthetic material.

Calibre 2236 drives this reference — a dedicated ladies' movement featuring the Syloxi silicon hairspring, a Rolex innovation that provides exceptional resistance to magnetism and temperature variation in a compact calibre. With 55 hours of power reserve, it outperforms many contemporary movements of comparable dimension. The 48-stone diamond bezel is pavé-set in white gold, each brilliant-cut diamond individually selected for consistency of colour and clarity. The President bracelet in white gold completes the ensemble, providing a fluid drape and direct family continuity with the Day-Date's original bracelet design.

Collectors seeking formal dress pieces in white gold have long prized the 178159 for its coherent, single-metal presentation — no two-tone compromise, just pure white gold from case to clasp. The dark MOP Roman dial variant is rarer on the secondary market than lighter MOP configurations, making well-preserved examples with original bracelet and box-and-papers particularly sought after. This reference rewards patient acquisition and careful storage.