Rolex Datejust 31 Yellow Rolesor — Grey Roman Diamond Bezel Dial | Ref. 178343

Reference 178343 is a Yellow Rolesor Datejust 31 distinguished by its 24-diamond bezel and grey dial with Roman numeral indices — a configuration that layers gem-setting with classical typography to produce a reading surface of considerable richness. The 31 mm case sits in Rolex's mid-size category, inheriting the Datejust's clean Oyster case architecture and translating it into a format that balances case presence with wearing discretion. The 178xxx series belongs to the generation preceding the 278xxx update, running the Calibre 2235 movement.

Calibre 2235 is the predecessor to the current 2236, a self-winding movement purpose-built for Rolex's mid-size Datejust references. The 24-diamond bezel is set with brilliant-cut diamonds across the full bezel circumference, requiring individual gemological assessment of each stone before setting. The grey dial is furnished with Roman numeral hour markers — a dial type that has remained in continuous production through the Datejust's history and favoured by wearers who prefer typographic indices over applied baton or diamond markers. Yellow Rolesor construction employs 18k yellow gold for the bezel, crown, and Jubilee bracelet centre links, with Oystersteel forming the case body and outer bracelet links. The Jubilee bracelet in matching Rolesor materials is the standard pairing for this reference.

The 178343 sits at an interesting juncture in the collecting market: as a pre-2023 generation reference, it is fully superseded by the 278xxx series with Calibre 2236, yet remains a well-supported, cleanly designed piece with broad aesthetic appeal. Diamond bezel Rolesor Datejust 31 references in this generation trade at accessible price points relative to current production, making them attractive to buyers seeking the full luxury specification without current retail premiums.