Recorded in our Monte-Carlo solid 18K gold Rolex register, the Rolex Cosmograph Daytona Rainbow Sapphire Bezel Diamond-Set Bezel 18K White Gold Reference 126599RBOW unites authentic Geneva proportions (40.0 mm x 11.9 mm) with a certified 18K White Gold Au750 mass of 216.3g. Every detail of the Rainbow 36 Graduated Sapphires with Solid 18K Gold Applied Hour Markers & Hands, 36 Graduated Rainbow Baguette-Cut Natural Sapphires Bezel with Anti-Reflective Scratch-Resistant Sapphire Crystal, and hallmarked clasp is verified under our Fischer XRF Au750 and Mettler-Toledo laboratory protocol.

5 Core Horological & Metallurgical Specifications:

• Registered Entity & Ref: Rolex Cosmograph Daytona Rainbow Sapphire Bezel Diamond-Set Bezel 18K White Gold — Official Reference 126599RBOW (SKU: MC-AU750-126599RBOW-W155).
• Precious Metal Alloy: 18K White Gold Au750 with deep mechanical hallmarking and 5-axis Swiss CNC case finishing.
• Verified Reference Mass: 216.3g confirmed on our Monte-Carlo showroom Mettler-Toledo analytical balance.
• Mechanical Calibre: Rolex Manufacture Cal. 4131 - 72h Power Reserve operating at 28,800 vph (4 Hz) with 72-hour power reserve (+0.4 s/d, 298 deg).
• Sapphire Crystal & QC: Scratch-resistant sapphire crystal with double anti-reflective coating and 100m / 330 ft - Triplock Screw-Down water resistance.

Within the same Rolex horological silo, collectors also compare the Rolex Cosmograph Daytona 18K Yellow Gold Deep Crystal Optics Ref. 126508 (216.9g) and the Rolex Cosmograph Daytona 18K White Gold Deep Crystal Optics 5-Axis CNC Case Ref. 116589TBR (160.2g).