Rolex Datejust 31 Yellow Gold — Blue Index Dial, Fluted Bezel | Ref. 178238

Reference 178238 presents the Datejust 31 in solid 18ct yellow gold with a fluted bezel and a blue dial set with applied index hour markers — a configuration that balances one of Rolex's most enduring dial colours against the warmth of monolithic precious metal construction. Blue dials on gold Rolex watches carry a long horological pedigree, and the sunburst finishing typically applied to these references gives the blue a dynamic quality that shifts from deep navy in shade to a silvery cobalt under direct light.

Calibre 2236 drives this reference, Rolex's purpose-built mid-size movement incorporating the Syloxi silicon hairspring. The Syloxi offers measurable advantages over conventional alloy hairsprings: it is insensitive to magnetic fields, more resilient against shocks, and thermally stable across a broader temperature range. Power reserve stands at 55 hours, and the movement is certified as a Superlative Chronometer to ±2 seconds per day accuracy. The President bracelet in 18ct yellow gold, with its hollow or solid three-piece links, completes a consistently elegant specification.

All-gold Datejust 31 references represent some of the most consistently liquid assets in the Rolex secondary market. The 178238's blue dial has broad cross-demographic appeal — it is a colour that works as convincingly with formal dress as with smart casual. Buyers entering the pre-owned market for a daily-wear precious metal Rolex frequently gravitate to this configuration, and genuine supply in immaculate condition is tighter than it appears, given that worn examples are common but pristine pieces much less so.