Rolex Datejust 31 Yellow Gold — Black Index Dial with 48-Diamond Bezel | Ref. 178158

The contrast between black and yellow gold is one of the most visually decisive pairings in watchmaking, and reference 178158 exploits it with full confidence: an 18ct yellow gold case and President bracelet set against a clean black index dial, crowned by a factory-set 48-diamond bezel that introduces brilliance without softening the composition's inherent boldness. The Datejust 31mm sits at the intersection of the brand's ladies' and mid-size ranges, and in full yellow gold — one of Rolex's most traditional precious metals — it carries a weight of history that two-tone or steel references simply cannot match.

Calibre 2235, the manufacture movement powering this reference, features a Glucydur beryllium balance wheel and a Parachrom hairspring in a blue colour, the latter providing ten times greater resistance to shocks than a standard hairspring. The President bracelet — reserved exclusively for Day-Date and full-gold Datejust references — is constructed in solid 18ct yellow gold with a concealed Crownclasp, giving it the same density and presence on the wrist as the case itself. The black dial, most likely lacquered or made with onyx, provides a deep, light-absorbing backdrop that allows the diamond bezel and gold indices to project maximum visual impact.

Full yellow gold Datejust 31 references with diamond bezels are among the most recognizable configurations in the secondary market, often associated with the brand's most dedicated collectors and long-term owners. The 178158 carries the prestige of solid precious metal construction throughout — no base metal components — which reinforces its value as both a luxury object and a horological investment. For buyers seeking an uncompromising expression of the Datejust's golden heritage, this reference delivers with consistency.