Rolex Day-Date 40 228235-0045 40mm

The Rolex Day-Date 40 reference m228235-0045 is a rare fusion of natural artistry and luxurious horology, a timepiece that has embodied prestige since the Day-Date’s debut in 1956. Crafted entirely in Rolex’s patented 18 kt Everose gold—a rose gold alloy with platinum for eternal warmth—this 40mm model features a unique eisenkiesel dial set with 10 baguette-cut diamonds and the signature fluted bezel, where earthy veined quartz meets precise gem-setting for exclusive, one-of-a-kind elegance. Introduced with eisenkiesel in 2021 as a brand first, it offers the iconic instantaneous day and date displays in a design of profound natural beauty.

Aesthetic Excellence and Unique Materials

The m228235-0045 enchants with its 40mm Oyster case—monobloc middle case, screw-down case back, and winding crown—all cast in-house from 18 kt Everose gold for exceptional purity and a soft, enduring rose glow. The fluted bezel in matching Everose gold, a Rolex hallmark, reflects light elegantly through its precise grooves.

The eisenkiesel dial is a natural masterpiece: this decorative stone, with its deep brown tones and delicately veined quartz structure, is carefully selected for unique color and pattern—ensuring every dial is truly individual. Elevated by 10 baguette-cut diamond hour markers for brilliant contrast and legibility, it shimmers with organic depth. The day window at 12 o’clock spells the day fully, the date at 3 o’clock is magnified by the Cyclops lens, and discreet Chromalight provides subtle visibility. Scratch-resistant sapphire crystal safeguards this rare stone surface.

The President bracelet—created in 1956 exclusively for the Day-Date—features semi-circular three-piece links in 18 kt Everose gold for supreme comfort and fluidity, secured by a concealed folding Crownclasp.

Technical Mastery and Reliability

The Calibre 3255, a next-generation perpetual self-winding mechanical movement fully designed and manufactured by Rolex, achieves Superlative Chronometer precision (-2/+2 seconds per day after casing). It incorporates:

• Paramagnetic blue Parachrom hairspring
• High-performance Paraflex shock absorbers
• Bidirectional Perpetual rotor

Functions include instantaneous day and date changes at midnight, secure rapid-setting, and stop-seconds. A 70-hour power reserve and Twinlock crown system deliver 100 metres (330 feet) water resistance.

Core Specifications

• Reference: Rolex Day-Date 40 (m228235-0045)
• Case Size: 40 mm
• Material: 18 kt Everose gold
• Bezel: Fluted, 18 kt Everose gold
• Dial: Eisenkiesel (deep brown decorative stone with veined quartz), set with 10 baguette-cut diamonds
• Bracelet: President, semi-circular three-piece links in 18 kt Everose gold
• Movement: Calibre 3255, Manufacture Rolex, self-winding
• Complications: Hours, minutes, seconds; instantaneous day and date with rapid-setting
• Power Reserve: Approximately 70 hours
• Water Resistance: 100 metres / 330 feet
• Crystal: Scratch-resistant sapphire with Cyclops lens over the date

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Essential Insights

1. What makes the eisenkiesel dial exceptional?

This rare decorative stone offers unique deep brown tones and veined quartz patterns in every piece, combined with 10 baguette-cut diamonds for natural, individualized beauty.

2. How does Everose gold enhance the overall design?

Rolex’s patented alloy with platinum prevents fading, cast in-house for a warm rose tone that complements the eisenkiesel’s earthy hues perfectly.

3. Why is the President bracelet a symbol of the Day-Date?

Designed exclusively in 1956, its semi-circular links in precious gold provide exceptional comfort and a concealed clasp for refined, seamless wear.

4. How does the Calibre 3255 ensure top-tier performance?

The Parachrom hairspring and Paraflex absorbers resist magnetism, temperature, and shocks, while the extended power reserve supports reliable, long-term accuracy.

5. What craftsmanship highlights the stone and diamond integration?

Rolex selects eisenkiesel for its unique structure, pairing it with precise diamond setting to create a harmonious, factory-original blend of nature and luxury.