The Rolex Oyster Perpetual Datejust 31 represents Rolex's enduring commitment to elegance, precision, and refined femininity. Reference 278383RBR combines Oyster case architecture with Yellow Rolesor construction—Rolex's signature blend of Oystersteel and 18ct yellow gold—creating harmonious marriage of steel's strength and reliability with gold's lustre and nobility. The 31mm diameter represents Rolex's quintessential ladies' sports watch proportions, offering perfect balance between presence and wrist comfort while maintaining instantly recognizable Datejust silhouette that has defined classic watchmaking since 1945. Yellow Rolesor featured on Rolex models since early 1930s, trademarked as name in 1933, remaining one of prominent pillars of Oyster Perpetual collection representing true Rolex signature. The watch embodies Datejust's heritage as witness to special days, featuring instantaneous date function beneath Cyclops lens magnification enabling precise time setting while maintaining 100 metres waterproofness for everyday confidence. The diamond-set bezel and mother-of-pearl dial elevate timepiece into jewellery-grade creation showcasing Rolex's gem-setting mastery and commitment to highlighting natural beauty. Each mother-of-pearl dial represents unique piece never found on another wrist, natural variations in colour intensity and structure creating individual character from shell extraction. The Jubilee bracelet designed and made especially for launch of Oyster Perpetual Datejust in 1945 provides supple and comfortable five-piece link metal construction embodying Rolex bracelet craftsmanship involving advanced high technology combined with aesthetic controls by human eye guaranteeing impeccable beauty.
The 31mm Oyster case fabricates from Yellow Rolesor combining Oystersteel and 18ct yellow gold, employing three-piece construction featuring monobloc middle case, screw-down case back, and screw-down winding crown. The Oyster case architecture invented by Rolex guarantees waterproofness to 100 metres or 330 feet, sealed hermetically through Twinlock double waterproofness system in screw-down crown providing two sealed zones. Monobloc middle case carved from solid Oystersteel block provides structural foundation, polished surfaces flowing into brushed case flanks creating refined contrast. Bezel measures approximately 6mm width mounting 46 brilliant-cut diamonds totaling approximately 0.70 carats, each diamond hand-set by Rolex gem-setters who finely carve precious metal to hand-shape seat in which each gemstone perfectly lodged. Gem-setters like sculptors place stones with art and craft of jeweller, meticulously aligning each with others before firmly securing in yellow gold setting. Several criteria contribute to beauty of Rolex gem-setting beyond intrinsic quality of stones: precise alignment of gem heights, their orientation and position, regularity strength and proportions of setting, intricate finishing of metalwork, creating sparkling symphony enhancing watch and enchanting wearer. Case construction ensures waterproofness through screw-down solid case back and Twinlock winding crown, crown featuring twin sealed zones protecting against water intrusion. Scratch-resistant sapphire crystal with Cyclops lens over date provides clear dial legibility while maintaining hermetic seal, Cyclops lens magnifying date 2.5 times for easy reading. Yellow gold crown features Rolex coronet emblem, crown guards flanking sides protecting winding mechanism.
The dial crafts from white mother-of-pearl featuring ten diamond hour markers set in 18ct gold settings creating luxurious time display. Mother-of-pearl by nature full of mystery and surprises, varying in colour from pink white black or yellow depending on origin, differing in colour intensity and structure according to part of shell from which extracted. At Rolex mother-of-pearl never artificially coloured, instead particular know-how and skill devoted to simply highlighting natural beauty and preserving original hues. Each mother-of-pearl dial represents unique piece making identical dial never found on another wrist, natural iridescence shifting subtly with light creating living surface that evolves throughout day. Ten brilliant-cut diamond hour markers position at all hour positions except 3 o'clock where date window resides, each diamond hand-set in 18ct yellow gold surrounds. Diamonds selected for exceptional quality clarity and brilliance, gem-setters meticulously placing each stone to ensure perfect alignment and secure mounting. Centre hours minutes and seconds hands fabricate from yellow gold matching Rolesor construction, hands filled with Chromalight luminescent material providing blue glow in darkness lasting up to eight hours. Date window positions at 3 o'clock framed by yellow gold surround, instantaneous date changing at midnight with rapid-setting function enabling independent date adjustment. Cyclops lens magnifies date 2.5 times providing enhanced legibility. Dial surface features subtle radial finishing creating depth and dimension, mother-of-pearl's natural luminosity enhanced by finishing techniques. Applied Rolex coronet positions at 12 o'clock, "ROLEX" signature and "OYSTER PERPETUAL DATEJUST" designation completing dial architecture. "SUPERLATIVE CHRONOMETER OFFICIALLY CERTIFIED" inscription confirms Superlative Chronometer certification.
Calibre 2236 Manufacture Rolex perpetual mechanical self-winding movement powers the watch entirely developed and manufactured by Rolex. The movement measures approximately 20mm diameter employing 31 jewels, oscillating at 28,800 vibrations per hour ensuring exceptional precision. Rolex Superlative Chronometer certification guarantees precision of minus two to plus two seconds per day after casing, exceeding COSC chronometer standard. The movement features centre hours minutes and seconds hands, instantaneous date with rapid setting enabling independent date adjustment without affecting timekeeping, stop-seconds function for precise time setting when crown pulled to time-setting position halting seconds hand enabling synchronization to reference signal. Syloxi hairspring in silicon with patented geometry provides superior shock resistance and magnetic immunity, silicon construction unaffected by magnetic fields and temperature variations ensuring consistent rate. High-performance Paraflex shock absorbers protect oscillator from shocks up to 50 percent more effectively than traditional systems. Bidirectional self-winding via Perpetual rotor enables automatic winding from wrist movements, rotor mounted on ball bearings ensuring smooth efficient winding. Power reserve provides approximately 55 hours of running time when fully wound, movement continuing to run for over two days when removed from wrist. The movement architecture features Rolex Parachrom blue paramagnetic hairspring in select models though Calibre 2236 employs Syloxi silicon hairspring, both providing superior performance. Escapement employs Swiss lever design with Chronergy escapement in newer calibres providing enhanced efficiency. Movement finishing features rhodium plating, decorated bridges, and signed Rolex coronet rotor. Superlative Chronometer certification includes COSC certification followed by additional Rolex testing after casing.
The Jubilee bracelet represents supple and comfortable five-piece link metal construction designed and made especially for launch of Oyster Perpetual Datejust in 1945. Bracelet fabricates from Yellow Rolesor combining Oystersteel three-piece solid centre links with 18ct yellow gold outer links creating elegant two-tone appearance. Five-piece link architecture featuring centre link flanked by four smaller links creates fluid drape conforming naturally to wrist curvature. Links employ solid construction rather than hollow providing substantial feel and durability. The design development and production of Rolex bracelets and clasps as well as stringent tests they face involve advanced high technology combined with aesthetic controls by human eye guaranteeing impeccable beauty. Bracelet measures approximately 16.5cm extended length with adjustment range accommodating various wrist sizes. Polished yellow gold outer links contrast with brushed Oystersteel centre links creating refined visual interest. Concealed folding Crownclasp integrates seamlessly into bracelet design opening to reveal Rolex coronet, clasp employing secure folding mechanism with safety catch preventing accidental opening. Bracelet attaches to lugs via solid end pieces ensuring secure connection, end pieces shaped to flow seamlessly from case to bracelet maintaining visual continuity.
The Datejust 31 Reference 278383RBR distinguishes through combination of Yellow Rolesor Oyster case construction blending Oystersteel strength with 18ct yellow gold lustre, 31mm diameter providing perfect ladies' proportions, diamond-set bezel featuring approximately 46 brilliant-cut diamonds totaling approximately 0.70 carats hand-set by Rolex gem-setters, white mother-of-pearl dial with ten diamond hour markers in 18ct gold settings creating unique piece never duplicated on another wrist, Calibre 2236 Manufacture Rolex movement providing Superlative Chronometer precision of minus two to plus two seconds daily with 55-hour power reserve, Syloxi hairspring in silicon with patented geometry ensuring magnetic immunity and shock resistance, instantaneous date with rapid setting beneath Cyclops lens magnification, Jubilee five-piece link bracelet in Yellow Rolesor designed for Datejust in 1945, 100 metres waterproofness via Oyster case with Twinlock crown, scratch-resistant sapphire crystal, Superlative Chronometer certification combining COSC and additional Rolex testing. The watch synthesizes Rolex sports watch engineering with jewellery-grade craftsmanship, Yellow Rolesor construction embodying Rolex signature dating to 1930s, mother-of-pearl dial's natural variations ensuring each watch represents individual creation, diamond setting executed to Rolex gem-setting standards ensuring precise alignment and secure mounting, Jubilee bracelet representing iconic Datejust design from 1945 launch, embodying Rolex commitment to precision elegance and enduring style.
