Updated
Rolex Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) vs Rolex Day-Date 18238 (18k yellow gold, blue diamond dial)
Two timepieces compared — $25,000+ vs $25,000+
Quick Verdict
The Rolex Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) ($25,000+) and Rolex Day-Date 18238 (18k yellow gold, blue diamond dial) ($25,000+) are closely matched timepieces at similar price points. The Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) emphasizes Rolex 2135, chronometer certified engineering while the Day-Date 18238 (18k yellow gold, blue diamond dial) focuses on Swiss Made craftsmanship.
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Rolex
Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial)
$25,000+
Specifications Compared
| Feature | Rolex Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) | Rolex Day-Date 18238 (18k yellow gold, blue diamond dial) |
|---|---|---|
| Price | $25,000+ | $25,000+ |
| Case Size | 26mm | 36mm |
| Movement | Automatic, Rolex calibre 2135, quickset date | Automatic, Rolex Calibre 3155 |
| Caliber Type | Rolex 2135, chronometer certified | Rolex 3155, in-house automatic, chronometer |
| Power Reserve | About 42 hours | About 48 hours |
| Water Resistance | 100m (10 ATM) per Rolex for the Oyster case | 100m (10 ATM) |
| Crystal | Sapphire Crystal | Sapphire Crystal, Cyclops |
| Case Material | 18k yellow gold, factory diamond bezel and diamond-set lugs | 18k yellow gold |
| Origin | Swiss Made | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Rolex's design language vs Rolex's approach
The Rolex Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) features a 18k yellow gold, factory diamond bezel and diamond-set lugs case at 26mm with Sapphire Crystal protection. The Rolex Day-Date 18238 (18k yellow gold, blue diamond dial) offers 18k yellow gold construction at 36mm with Sapphire Crystal, Cyclops. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic, Rolex calibre 2135, quickset date vs Automatic, Rolex Calibre 3155
The Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) runs the Automatic, Rolex calibre 2135, quickset date (Rolex 2135, chronometer certified, About 42 hours power reserve) at standard frequency. The Day-Date 18238 (18k yellow gold, blue diamond dial) uses the Automatic, Rolex Calibre 3155 (Rolex 3155, in-house automatic, chronometer, About 48 hours reserve) at standard. The Day-Date 18238 (18k yellow gold, blue diamond dial) offers a longer power reserve.
Wearability & Fit
26mm vs 36mm — different wrist presence
At 26mm, the Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) wears more compactly on smaller wrists compared to the Day-Date 18238 (18k yellow gold, blue diamond dial) at 36mm. Water resistance differs: 100m (10 ATM) per Rolex for the Oyster case vs 100m (10 ATM).
Value & Cost of Ownership
Same tier — different value propositions
The Rolex Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) sits at $25,000+ and the Rolex Day-Date 18238 (18k yellow gold, blue diamond dial) at $25,000+. On the specs that outlast any price: the Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) uses Sapphire Crystal with About 42 hours, against Sapphire Crystal, Cyclops and About 48 hours on the Day-Date 18238 (18k yellow gold, blue diamond dial). Service intervals are typically 5-7 years for both.
Water Resistance
100m (10 ATM) per Rolex for the Oyster case vs 100m (10 ATM)
The Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) is rated to 100m (10 ATM) per Rolex for the Oyster case while the Day-Date 18238 (18k yellow gold, blue diamond dial) handles 100m (10 ATM). Both offer identical water resistance ratings.
Our Verdict
Rolex
Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial)
Choose the Rolex Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) if you prioritize Rolex 2135, chronometer certified engineering, Swiss Made craftsmanship, and 100m (10 ATM) per Rolex for the Oyster case water resistance. At $25,000+, it delivers Automatic, Rolex calibre 2135, quickset date with About 42 hours power reserve.
Check Price on AmazonRolex
Day-Date 18238 (18k yellow gold, blue diamond dial)
Choose the Rolex Day-Date 18238 (18k yellow gold, blue diamond dial) if you value Rolex 3155, in-house automatic, chronometer technology, Swiss Made heritage, and 36mm proportions. At $25,000+, the Automatic, Rolex Calibre 3155 with About 48 hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Rolex Lady-Datejust 26 (18k gold, diamond bezel and lugs, red vignette dial) and Rolex Day-Date 18238 (18k yellow gold, blue diamond dial) represent two distinct approaches to the timepiece category — the Rolex bringing Swiss Made tradition while Rolex delivers Swiss Made engineering.
Frequently Asked Questions
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How This Page Was Made
Our comparisons are generated from a hand-maintained specification database and reviewed under our editorial standards. We use AI tools to assemble pages from that data. We don’t invent specs: every number traces back to the database, and when we correct an entry, the fix is applied site-wide. As an Amazon Associate, The Horologist earns from qualifying purchases.