Fischer XRF Au750 (75.0%) & Mettler-Toledo Gravimetric Verification
The Rolex Cosmograph Daytona Diamond-Set Bezel 18K White Gold Reference 126599TSA is a direct Swiss foundry specimen engineered in 18K White Gold Au750 (40.0 mm x 11.9 mm) with a certified Mettler-Toledo mass of 216.5g, Fischer XRF Au750 metallurgical verification, and Rolex Manufacture Cal. 4131 - 72h Power Reserve running at 28,800 vph (+0.4 s/d, 296 deg) with a 72-hour power reserve and 100m / 330 ft - Triplock Screw-Down rating.
Catalogued in our direct Swiss foundry Rolex assay archive under Specimen Code LAB-XRF-126599TSA-W720, this Rolex Cosmograph Daytona Diamond-Set Bezel 18K White Gold Reference 126599TSA is smelted and CNC-machined in 18K White Gold Au750 (40.0 mm x 11.9 mm). Prior to archival release, the completed assembly is weighed on a calibrated Mettler-Toledo balance at 216.5g and scanned via non-destructive Fischer XRF spectroscopy.
What Defines the Off-Catalog Rolex Daytona Ref. 126599TSA "Blue Sapphire" Silver Sheen Obsidian Dial?
The Rolex Cosmograph Daytona Reference 126599TSA (collector nickname "Blue Sapphire") is an off-catalog solid 18K white gold haute joaillerie chronograph featuring a natural Silver Sheen volcanic obsidian dial, 36 baguette-cut blue sapphires on the bezel (Taille Saphir), and 54 brilliant-cut diamonds across the lugs and crown guards, because each specimen is calibrated to 216.5g with Rolex Manufacture Cal. 4131 - 72h Power Reserve.
5 Core Foundry & Laboratory Assay Specifications:
- Foundry Specimen Entity: Rolex Cosmograph Daytona Diamond-Set Bezel 18K White Gold — Official Ref. 126599TSA (Specimen LAB-XRF-126599TSA-W720).
- XRF Metallurgical Assay: 18K White Gold Au750 certified for elemental composition and hallmark integrity.
- Mettler-Toledo Mass: 216.5g verified gravimetric parity matching the authentic manufacture reference.
- Chronometric Calibre: Rolex Manufacture Cal. 4131 - 72h Power Reserve beating at 28,800 vph (4 Hz) with 72-hour reserve and +0.4 s/d, 296 deg Witschi trace.
- Optical & Pressure Testing: Double anti-reflective sapphire crystal, Natural Black & Silver Sheen Volcanic Obsidian Stone Dial with 18K White Gold Applique Baguette Blue Sapphire Hour Markers and Silvery-Gray Chronograph Counters, and 100m / 330 ft - Triplock Screw-Down barometric sealing.
Within the Rolex Cosmograph Daytona horological sub-silo, collectors also compare the Rolex Cosmograph Daytona Aventurine Starry Dial 18K Everose Gold Ref. 126505 (216.2g) and the Rolex Cosmograph Daytona Black Obsidian Dial & Sapphire Bezel 18K White Gold Ref. 126599TSA (216.9g).
- Parent Brand & Cosmograph Daytona Silo Hub: Browse All 289 Certified Rolex Solid 18K Gold & Pt950 Watches
- Technical Research Monograph: Fischer XRF Au750 Spectrometry Watch Authentication SOP-750 (All 5 Journal Monographs)
- Homepage Master Register: Return to 18K FACTORY Homepage (Complete 774-Watch Solid 18K Gold & Pt950 Register)
- All-Brands Catalogue: Explore Complete 12-Maison Horological Catalogue (/shop/)
- Metallurgical & Escrow Verification: Fischer XRF Au750 Protocol • 3-Year Mechanical Warranty • Insured Armored Delivery
What laboratory instruments certify Reference 126599TSA (Rolex)?
Every 18K Factory specimen is verified on three calibrated instruments on 4K video: a Mettler-Toledo analytical balance (216.5g), a Fischer XRF spectrometer (18K White Gold Au750), and a Witschi Chronoscope (+0.4 s/d, 296 deg).
Does the 216.5g reading match the authentic original Rolex 126599TSA weight?
Yes. Our CNC foundry machines the 18K White Gold case and bracelet to replicate the exact 216.5g reference mass of the authentic manufacture timepiece.
What are the movement specifications for Reference 126599TSA?
Reference 126599TSA is powered by the Rolex Manufacture Cal. 4131 - 72h Power Reserve operating at 28,800 vph (4 Hz) with a 72-hour power reserve, regulated across six positions to +0.4 s/d, 296 deg.
What does the TSA suffix and Silver Sheen Obsidian dial signify on Rolex Daytona Ref. 126599TSA?
On Rolex Cosmograph Daytona Reference 126599TSA (known to collectors as the "Blue Sapphire" Off-Catalog Daytona), the TSA designation stands for Taille Saphir: 36 graduated baguette-cut blue sapphires bezel-set into solid 18K white gold, paired with 54 brilliant-cut diamonds on the lugs and crown guards and a natural volcanic Silver Sheen Obsidian stone dial weighing 216.5g.
Rolex Cosmograph Daytona Diamond-Set Bezel 18K White Gold Ref. 126599TSA — XRF Certified Edition
Fischer XRF Verified 18K White Gold Au750 • Mettler-Toledo 216.5g • Rolex Manufacture Cal. 4131 - 72h Power Reserve
| Assay Specimen ID & Official Reference | Rolex — Oyster Perpetual Cosmograph Daytona | Ref. 126599TSA | SKU: LAB-XRF-126599TSA-W720 |
|---|---|
| Fischer XRF Elemental Purity & Alloy | 18K White Gold Au750 — Au750 — 75.0% Pure 18K Gold Bullion (XRF Verified) • Hallmarked Solid Precious Metal |
| Mettler-Toledo Gravimetric Mass (g) | 216.5g — 1:1 Authentic Reference Mass Verified on Mettler-Toledo Analytical Scale |
| Bezel Tolerance, Gem-Setting & Case Dimension | Off-Catalog 18K White Gold Bezel Hand-Set with 36 Baguette-Cut Blue Sapphires (TSA — Taille Saphir) and 54 Brilliant-Cut VVS Diamonds on the Case Lugs and Crown Guards • 216.5g 18K White Gold • 40.0 mm x 11.9 mm |
| Calibre Reference & Witschi Chronometry | Rolex Manufacture Cal. 4131 - 72h Power Reserve — Swiss Super Clone Mechanical Calibre Regulated to +0.4 s/d, 296 deg |
| Isochronism Frequency & Autonomous Power Reserve | 72-Hour Power Reserve • 28,800 vph (4 Hz) Free-Sprung Balance Wheel |
| Double AR Sapphire Crystal & Barometric Rating | Scratch-Resistant Sapphire Crystal with Double Anti-Reflective Coating • 100m / 330 ft - Triplock Screw-Down |
| Dial Metallurgy & Clasp Hallmark Verification | 40.0 mm x 11.9 mm • Natural Black & Silver Sheen Volcanic Obsidian Stone Dial with 18K White Gold Applique Baguette Blue Sapphire Hour Markers and Silvery-Gray Chronograph Counters • Integrated 18K White Gold Solid Link Bracelet & Deployant Clasp with Deep Laser Hallmarks |