Rolex Datejust 31 Yellow Gold — Mother-of-Pearl Diamond Dial, Fluted Bezel | Ref. 278278

Reference 278278 belongs to the current 278xxx generation of the Datejust 31, introduced in 2018 and powered by Calibre 2236 — Rolex's self-winding movement developed specifically for the brand's mid-size and lady's references. In yellow gold with a mother-of-pearl dial set with diamond hour markers and a fluted bezel, this is a maximally expressive example of the 31 mm Datejust: organic iridescence, precious metal warmth, gemstone precision, and the mechanical authority of a Superlative Chronometer, all in a wrist-friendly 31 mm case.

Calibre 2236 introduced the Syloxi silicon hairspring to Rolex's mid-size calibre range, offering improved isochronism and resistance to magnetic fields and temperature fluctuations. The movement provides a 55-hour power reserve and meets Rolex's Superlative Chronometer standard of ±2 seconds per day. The yellow gold Oyster case is water resistant to 100 metres. The mother-of-pearl dial — likely sourced from natural shell and finished to Rolex's high tolerances — shifts between cream, ivory, and subtle blue or green depending on incidence angle and lighting, while the diamond hour markers introduce structured brilliance against that organic ground. The fluted bezel in 18-carat yellow gold frames the dial with characteristic architectural precision.

This configuration targets buyers seeking a complete luxury experience in a mid-size format: precious metal, organic dial material, and diamonds, delivered by one of the world's most trusted movement makers. The 278xxx generation is current production, meaning parts and service availability are excellent for decades to come. Yellow gold with MOP diamond dial is among the most sought-after combinations in the Datejust 31 family, and represents a sound long-term acquisition for the discerning collector.