18K SOLID GOLD
PLACE VENDOME & GENEVA SOLID 18K GOLD SALON • HALLMARKED AU750 & PT950 • PRIVATE CLIENT ALLOCATION • INSURED ARMORED DELIVERY
18K SOLID GOLD • PARIS Place Vendome & Geneva Haute Horlogerie in Solid 18K Gold Au750 Certified by Fischer XRF Spectrometry
MAISON TECHNICAL DOSSIER • SOLID 18K GOLD AU750

Place Vendome Metallurgical & Hallmark Research Journal — Solid 18K Gold (Au750) & Pt950 Monographs

Editorial Mission & Quantitative Standards: The 18K SOLID GOLD Research Journal publishes original, laboratory-verified horological monographs documenting 75.0% pure Solid 18-Karat Gold (Au750) and 95.0% pure Platinum (Pt950) watchmaking. Every article contains structured reference data tables, calibrated Mettler-Toledo 0.01g mass measurements, Fischer XRF elemental spectra, and 6-position Witschi Chronoscope X1 benchmarks. Return to the 18K SOLID GOLD Homepage Master Register or browse the Complete 774-Timepiece Catalogue.

Master Index of Published Horological & Metallurgical Monographs (18K SOLID GOLD)
#Published Monograph & Technical GuidePrimary Brand FocusPublication DateLead AuthorDirect Dossier
01Swiss St. Bernard Poincon & Au750 Gold Hallmarks GuideRolexDr. Henri-Laurent VaucherRead Monograph →
0218K Yellow, Everose & White Gold Watch Alloy MetallurgyRolexDr. Henri-Laurent VaucherRead Monograph →
03Solid Au750 Gold vs. PVD Plated Watches: Gram Weight ProofRolexDr. Henri-Laurent VaucherRead Monograph →
04Patek Philippe Nautilus & Aquanaut 18K Rose Gold Gram IndexPatek PhilippeDr. Henri-Laurent VaucherRead Monograph →
05Pt950 Platinum Ice-Blue Dial Watches: Density & Mass GuideRolexDr. Henri-Laurent VaucherRead Monograph →

Featured Horological Research Monographs (100% Original Laboratory Editions)

Macro view through a jeweler loupe of a deep-struck Swiss St. Bernard dog head and Au750 hallmark on a solid 18K yellow gold watch lug
• 9 min read • By Dr. Henri-Laurent Vaucher

Swiss St. Bernard Poincon, Au750 Scales & Place Vendome Eagle Head Hallmarks: Complete Metallurgical Guide

An official Swiss Au750 horological hallmark is a legally regulated precious-metal stamp—most notably the Swiss Official Precious Metal Control (CMP) St. Bernard dog head and the 750 balance scales—certifying that a watch case and bracelet contain a minimum of 750 parts per thousand (75.0% by mass) pure elemental gold.

Three solid 18K gold luxury watch cases in yellow gold, Everose pink gold, and warm white gold beside pure gold granules and platinum pellets
• 8 min read • By Dr. Henri-Laurent Vaucher

18K Yellow Gold vs. Everose Rose Gold vs. Grey White Gold: Horological Alloy Composition & Vickers Hardness

While all 18-karat horological gold alloys contain exactly 75.0% pure elemental gold (Au750), their color, density (15.15 to 16.05 g/cm3), and Vickers micro-hardness (155 to 215 HV) are governed by the remaining 25.0% ternary balance of silver (Ag), copper (Cu), palladium (Pd), and platinum (Pt).

Solid 18K yellow gold chronograph luxury watch weighed inside a precision Mettler-Toledo analytical balance next to a gold bullion bar
• 10 min read • By Dr. Henri-Laurent Vaucher

Solid 18K Gold (Au750) vs. PVD Gold-Plated & Tungsten Watches: Gravimetric Scale & XRF Detection Protocol

A genuine solid 18K gold (Au750) watch has a homogeneous specific gravity of 15.40 to 15.95 g/cm3 and weighs 185g to 228g on a full bracelet, whereas PVD gold-plated 904L steel watches weigh only 135g to 148g and tungsten-cored counterfeits fail ultrasonic velocity and internal-bore XRF testing.

Macro studio portrait of a solid 18K rose gold Patek Philippe Nautilus with brown sunburst dial and sapphire caseback showing the 21K gold rotor
• 9 min read • By Dr. Henri-Laurent Vaucher

Patek Philippe Nautilus & Aquanaut Solid 18K Rose Gold Weight Index: Ref. 5711/1R, 5712/1R, 5980/1R & 5167R

In solid 18K rose gold (Au750 5N), Patek Philippe Nautilus and Aquanaut references achieve an ultra-thin profile (8.3 mm to 12.2 mm) paired with substantial precious-metal mass: 186.8g for the Nautilus Ref. 5711/1R-001, 192.4g for the Moonphase Ref. 5712/1R-001, 218.5g for the Chronograph Ref. 5980/1R-001, and 144.2g for the Aquanaut Ref. 5167R-001.

Macro studio portrait of a 950 platinum Rolex Daytona Platona with an ice-blue dial, baguette diamond markers, and chestnut brown ceramic bezel
• 8 min read • By Dr. Henri-Laurent Vaucher

950 Platinum (Pt950) & Ice-Blue Dial Horology: Why the Rolex Daytona Platona 116506 Weighs 282.0 Grams

Crafted at 950 parts per thousand (95.0% pure platinum alloyed with 5.0% ruthenium), horological Pt950 possesses an extraordinary density of 21.45 g/cm3—nearly 38% denser than 18K gold (15.58 g/cm3)—enabling flagship ice-blue dial models like the Rolex Cosmograph Daytona Platona Ref. 116506 and 126506 to achieve a verified mass of 282.0 grams.

Browse Solid 18K Gold & Pt950 Horological Collections

Every creation presented by 18K SOLID GOLD is forged in solid 18-Karat Gold (Au750) or 950 Platinum to achieve 1:1 gravimetric parity with its Geneva reference (up to 282.4 grams), verified on 4K video via Fischer XRF spectroscopy and a Mettler-Toledo analytical balance.

What distinguishes 18K Solid Gold Paris (18K Solid Gold Salon) from standard watch retailers?

Our salon specializes in hallmarked Au750 solid 18-karat yellow, rose, Everose, and white gold timepieces alongside bespoke 1:1 collector commissions, each accompanied by analytical scale and XRF metallurgical verification.

Are all 6 gallery portraits per timepiece photographed in your salon studio?

Yes. Every watch in our 774-piece collection displays 6 unedited macro studio angles capturing the dial, hallmarks, clasp, and case flanks.

How do I receive my personalized 4K scale and hallmark inspection video?

Contact our Place Vendome & Geneva Private Client Concierge via WhatsApp (+1 305 724 0661) or request a private allocation to receive your live 4K video dossier prior to dispatch.

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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

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