18K WATCHES
PLACE DU CASINO, MONTE-CARLO & RUE DU RHONE GENEVA SALON FISCHER XRF Au750 (75.0%) SOLID 18K GOLD & PT950 CERTIFIED PRIVATE CLIENT ALLOCATION • INSURED ARMORED VAULT DELIVERY
18K WATCHES MONTE-CARLO • GENEVA
MONTE-CARLO FLAGSHIP SALON • AU750 & PT950

The Crown of Solid 18-Karat Gold Horology

Welcome to our Monte-Carlo and Geneva private client showroom. Every timepiece in our collection is CNC-machined in solid 18K yellow, Everose, or white gold and 950 platinum to match the exact gram weight of its Geneva reference.

186g – 282.4g Verified Mettler-Toledo Mass
Au750 (75.0%) Au Fischer XRF Assay Certificate
±0.5 s/d 6-Position Witschi Rate
Explore All 774 Showroom Pieces Inspect Featured 116508
SALON SHOWCASE • Rolex 116508 216.5g • 18K Yellow Gold
Rolex Cosmograph Daytona John Mayer Emerald Green Dial 18K Yellow Gold Ref. 116508
Rolex Cosmograph Daytona John Mayer Emerald Green Dial 18K Yellow Gold Ref. 116508
Est. $86,000 • Direct: $24,600
IMMEDIATE SALON ALLOCATIONS

Flagship Solid 18K Gold & Platinum Timepieces

Each watch includes 6 studio angles & pre-shipment 4K scale video
THE MONTE-CARLO ASSAY GUARANTEE

Why Weight in Grams Is the Ultimate Proof of Solid Gold

Standard stainless steel watches weigh between 135g and 148g. Genuine 18-karat gold (15.5 g/cm³) and 950 platinum (21.45 g/cm³) possess dramatically higher metallurgical density. Before your timepiece leaves our salon, our watchmaker records a live 4K video of your exact watch on a Mettler-Toledo scale and Fischer XRF spectrometer.

ROLEX DAYTONA 116508
207.0 Grams
Solid 18K Yellow Gold Au750
ROLEX DAYTONA 126506
282.5 Grams
950 Platinum Pt950 Ice Blue

Collector Frequently Asked Questions

How does 18K Watches Monte-Carlo verify 1:1 authentic reference gram weight?

Every timepiece in our 774-watch register is engineered in Solid 18K Gold Au750, 950 Platinum, or Bespoke 5-Axis CNC architecture and weighed on a calibrated Mettler-Toledo laboratory scale to match the exact original factory weight.

Are the 6 photos shown for each watch real Monte-Carlo showroom photographs?

Yes. Every reference features 6 unedited real photographs (Front Dial, 45° Profile, Bezel Geometry, Crown Flank, Calibre Caseback, and Clasp) taken on our QC bench.

How does the pre-shipment 4K QC video & XRF assay approval work?

When you reserve a timepiece via our Private Client Concierge (+1 305 724 0661), our master watchmaker sends a personalized 4K video on the digital gram scale, Fischer XRF spectrometer, and Witschi Chronoscope.

MONTE-CARLO SHOWROOM REGISTER

18K Watches Monte-Carlo — Complete 774-Piece Sovereign Register

Master Horological Gravimetric & Metallurgical Matrix

18K WATCHES — 12-Maison Solid 18K Gold (Au750) & Pt950 Reference Weight Standards

Every timepiece across our 774-watch register is precision-engineered to match 1:1 Geneva reference weights on a calibrated Mettler-Toledo 0.01g balance and verified via Fischer XRF Au750 spectroscopy and 6-position Witschi Chronoscope testing.

Master Precious-Metal Horology Specification & Reference Weight Table (18K WATCHES)
Horological MaisonFlagship Reference ArchetypesPrecious Metal FinenessVerified Mass RangeBenchmark CalibresCategory Hub
Rolex GenevaDaytona 116508/126508, Day-Date 228238/228235, Submariner 126618Solid 18K Au750 & Pt950158.8g – 282.4gCal. 4130, 4131, 3255, 9001Rolex Register →
Patek PhilippeNautilus 5711/1R, 5712/1R, 5980/1R, Aquanaut 5167R, 5711/113PSolid 18K Rose/White & Pt950106.0g – 244.8gCal. 26-330 S C, 240 PS, CH 28-520Patek Register →
Audemars PiguetRoyal Oak 15500OR, Openworked 15407OR, Chronograph 26240ORSolid 18K Pink/White Gold174.6g – 238.0gCal. 4302, 3132, 4401 FlybackAP Register →
Richard MilleRM 52-05 Tourbillon, RM 56 Sapphire, RM 055 / RM 35-02 18K GoldSolid 18K Red Gold, Sapphire, NTPT68.5g – 164.0gCal. RMUL2, RMAL1, TourbillonRM Register →
Vacheron ConstantinOverseas 4500V/110R, Chronograph 5500V/110R, Perpetual Ultra-ThinSolid 18K 5N Pink Gold (Au750)178.0g – 232.0gCal. 5100, Cal. 5200, Cal. 1120 QPVC Register →
Cartier ParisSantos Large WGSA0007/0019, Santos Skeleton, London Crash, Ballon BleuSolid 18K Yellow & Rose Gold64.5g – 194.5gCal. 1847 MC, 9629 MC, 8970 MCCartier Register →
Monte-Carlo Horological Research Journal

Latest Horological Research Monographs & Assay Guides

View All 5 Research Monographs (/journal/) →
● Added to Private Selection Portfolio
Private Client Concierge Desk

Allocation Portfolio (0)

Pre-Shipment 4K Scale & Timing Video Included Insured Vault Delivery
Verified Reference Mass 0.0g Verified
Total Private Allocation $0
Includes Personalized 4K Mettler-Toledo Scale & Witschi Timegrapher Dossier
All removed bracelet links accompany your timepiece inside the presentation box • Insured Brink's / DHL Express Priority
PRIVATE CLIENT DESK
Geneva • Monte-Carlo • Place Vendome

Private Allocation & 4K QC Dossier

1. Select Preferred Settlement Arrangement:
Allocation Dossier Reference
ALLOC-2026-884920
Total Allocation Value
$26,900 USD
Pre-Shipment 4K Laboratory Verification Protocol: Before any funds are finalized or your timepiece is dispatched, our Senior Watchmaker records a personalized 4K video of your exact serial number on a calibrated Mettler-Toledo gram scale and Witschi Chronoscope timegrapher.
GRAVIMETRIC & HOROLOGICAL SPECIFICATION MATRIX

Compare Selected Timepieces