DATEJUST 31
REFERENCE
278273
MODEL CASE
Oyster, 31 mm, Oystersteel and yellow gold
BEZEL
Fluted
WATER-RESISTANCE
Waterproof to 100 metres / 330 feet
MOVEMENT
Perpetual, mechanical, self-winding
CALIBRE
2236, Manufacture Rolex
POWER RESERVE
Approximately 55 hours
BRACELET
Oyster, flat three-piece links
DIAL
Olive green set with diamonds
CERTIFICATION
Superlative Chronometer (COSC + Rolex certification after casing)
OYSTER ARCHITECTURE
Monobloc middle case, screw-down case back and winding crown
DIAMETER
31 mm
MATERIAL
Yellow Rolesor - combination of Oystersteel and yellow gold
WINDING CROWN
Screw-down, Twinlock double waterproofness system
CRYSTAL
Scratch-resistant sapphire, Cyclops lens over the date
PRECISION
-2/+2 sec/day, after casing
OSCILLATOR
Syloxi hairspring in silicon with patented geometry. High-performance Paraflex shock absorbers
WINDING
Bidirectional self-winding via Perpetual rotor
BRACELET MATERIAL
Yellow Rolesor - combination of Oystersteel and yellow gold
CLASP
Folding Oysterclasp with Easylink 5 mm comfort extension link
GEM SETTING
Diamonds in 18 ct gold settings


Olive Green Dial
The sunray finish creates delicate light reflections on many dials in the Oyster Perpetual collection. It is obtained using masterful brushing techniques that create grooves running outwards from the centre of the dial. Light is diffused consistently along each engraving, creating a characteristic subtle glow that moves depending on the position of the wrist.
Once the sunray finish has been completed, the dial colour is applied using Physical Vapour Deposition or electroplating. A light coat of varnish gives the dial its final look.
The Fluted Bezel
The Rolex fluted bezel is a mark of distinction. Originally, the fluting of the Oyster bezel had a functional purpose: it served to screw the bezel onto the case helping to ensure the waterproofness of the watch. It was therefore identical to the fluting on the case back, which was also screwed onto the case for waterproofness, using specific Rolex tools. Over time, the fluting became an aesthetic element, a genuine Rolex signature feature. Today the fluted bezel is a mark of distinction, always in gold.


Yellow Rolesor
Gold is coveted for its lustre and nobility. Steel reinforces strength and reliability. Together, they harmoniously combine the best of their properties. A true Rolex signature, Rolesor has featured on Rolex models since the early 1930s, and was trademarked as a name in 1933. It is one of the prominent pillars of the Oyster collection.

REFERENCE
278273
MODEL CASE
Oyster, 31 mm, Oystersteel and yellow gold
BEZEL
Fluted
WATER-RESISTANCE
Waterproof to 100 metres / 330 feet
MOVEMENT
Perpetual, mechanical, self-winding
CALIBRE
2236, Manufacture Rolex
POWER RESERVE
Approximately 55 hours
BRACELET
Oyster, flat three-piece links
DIAL
Olive green set with diamonds
CERTIFICATION
Superlative Chronometer (COSC + Rolex certification after casing)
OYSTER ARCHITECTURE
Monobloc middle case, screw-down case back and winding crown
DIAMETER
31 mm
MATERIAL
Yellow Rolesor - combination of Oystersteel and yellow gold
WINDING CROWN
Screw-down, Twinlock double waterproofness system
CRYSTAL
Scratch-resistant sapphire, Cyclops lens over the date
PRECISION
-2/+2 sec/day, after casing
OSCILLATOR
Syloxi hairspring in silicon with patented geometry. High-performance Paraflex shock absorbers
WINDING
Bidirectional self-winding via Perpetual rotor
BRACELET MATERIAL
Yellow Rolesor - combination of Oystersteel and yellow gold
CLASP
Folding Oysterclasp with Easylink 5 mm comfort extension link
GEM SETTING
Diamonds in 18 ct gold settings

Olive Green Dial
The sunray finish creates delicate light reflections on many dials in the Oyster Perpetual collection. It is obtained using masterful brushing techniques that create grooves running outwards from the centre of the dial. Light is diffused consistently along each engraving, creating a characteristic subtle glow that moves depending on the position of the wrist.
Once the sunray finish has been completed, the dial colour is applied using Physical Vapour Deposition or electroplating. A light coat of varnish gives the dial its final look.

The Fluted Bezel
The Rolex fluted bezel is a mark of distinction. Originally, the fluting of the Oyster bezel had a functional purpose: it served to screw the bezel onto the case helping to ensure the waterproofness of the watch. It was therefore identical to the fluting on the case back, which was also screwed onto the case for waterproofness, using specific Rolex tools. Over time, the fluting became an aesthetic element, a genuine Rolex signature feature. Today the fluted bezel is a mark of distinction, always in gold.

Yellow Rolesor
Gold is coveted for its lustre and nobility. Steel reinforces strength and reliability. Together, they harmoniously combine the best of their properties. A true Rolex signature, Rolesor has featured on Rolex models since the early 1930s, and was trademarked as a name in 1933. It is one of the prominent pillars of the Oyster collection.