Rolex Datejust 31 Yellow Rolesor — Black Diamond Index Dial | Ref. 178343

The Rolex Datejust 31 reference 178343 in Yellow Rolesor pairs the understated power of Oystersteel with the warmth of 18 ct yellow gold in a combination that Rolex terms Rolesor — a proprietary bi-material construction in which the case middle and bracelet centre links are steel while the bezel and bracelet outer links are yellow gold. This creates a watch of inherently layered visual character, with the 24-diamond bezel providing a further plane of brilliance above the architectural contrast of the case. The black dial with diamond-set index markers and Roman numeral details produces a bold, high-contrast composition against the gold and steel surround.

Driving the Datejust 31 within the 178xxx reference family is calibre 2235, Rolex's self-winding movement for ladies and mid-size complications. The 2235 features a Glucydur balance wheel, Parachrom hairspring for magnetic and thermal resistance, and a Perpetual rotor for bidirectional automatic winding. The date display, shown at three o'clock beneath the signature Cyclops magnifying lens, advances cleanly and is supported by a date quickset function. The Oyster case provides 100-metre water resistance, making this Datejust as practical as it is ornamental.

Yellow Rolesor Datejust 31 examples with diamond bezels and black dials occupy a particular position in the pre-owned market: they offer the visual drama of a precious-metal watch at a more accessible price point than full gold equivalents, while the diamond bezel and striking dial configuration ensure they read as occasion pieces of genuine presence. The 178343 reference has attracted consistent collector attention for its balance of decorative ambition and everyday wearability — a combination that continues to resonate strongly with informed buyers.