Fine Jewelry & Haute Horlogerie

Certified Precious Metals Casting & CNC Micro-Machining

Certified precious metals manufacturing for fine jewelry lines, solid gold watch cases, high-value bezels, and bespoke commemorative medals. We cast and machine vacuum-induction melted 925 sterling silver, 14K / 18K solid yellow, white, and rose gold (585 / 750), and 950 platinum with complete assay certification and zero micro-porosity.

Material Benchmark

  • Gold Alloys 14K (58.5% Au) & 18K (75.0% Au) Solid Gold
  • Silver Alloys 925 Sterling Silver (92.5% Ag, 7.5% deoxidized Cu)
  • Platinum Grade Pt950 (95.0% pure platinum alloyed with ruthenium)
  • Casting Technology Digital Vacuum Induction Pressure Casting
  • Surface Porosity Zero micro-porosity under 40x optical inspection
  • Hallmarking Compliance Full compliance with Swiss & UK Assay Office standards
  • Finishing Treatments Rhodium plating, e-coating, micro-pave stone setting
  • Scrap Recovery Control Closed-loop precious metal refining & assay accounting
Technical Scope

Precious Metal Processing Configurations

Merging age-old lost wax vacuum casting with 5-axis CNC diamond finishing for uncompromising luxury.

Haute Horlogerie

Solid 18K Gold Watch Cases

Dense, vacuum-cast and CNC precision finished 18K yellow, rose, and white gold watch cases. Machined to hold precise movement seats and sapphire crystal gasket compression.

  • Gold Weight Control Toleranced within ±0.15 grams
  • Case Rigidity Work-hardened alloy prevents lug deformation
  • Bevel Facets Hand-lapped flat mirror chamfers
Designer Jewelry Collections

925 Sterling Silver Jewelry

Lost-wax cast and CNC detailed rings, pendants, Cuban curb chains, and cuffs. Finished with multi-micron anti-tarnish rhodium or heavy 18K vermeil gold plating.

  • Silver Purity Certified 92.5% pure silver
  • Plating Longevity Up to 2.5 µm gold vermeil standard
  • Stone Settings Secure micro-prong, bezel, and channel settings
Noble Metal Resilience

950 Platinum Crafting

Dense, substantial Pt950 platinum components offering heirloom durability and a deep, naturally pure white metallic sheen that never requires replating.

  • Density Benchmark 21.45 g/cm³ (Extremely substantial heft)
  • Wear Character Displaces metal rather than losing material
  • Hypoallergenic 95% pure noble metal purity
Material Benchmarks

Precious Metals Metallurgical & Physical Benchmarks

Strict chemical composition limits and mechanical standards applied across every production batch.

Metal Category Hallmark Purity Density (g/cm³) Vickers Hardness (HV) Core Application
18K Yellow Gold 750 / 1000 Au 15.5 g/cm³ 140 to 160 HV Classic luxury watch cases, eternity rings, fine bracelets
18K Rose Gold (5N) 750 / 1000 Au 15.2 g/cm³ 150 to 180 HV Warm vintage dress watches, bridal rings, pendants
14K Solid Gold 585 / 1000 Au 13.1 g/cm³ 160 to 190 HV Durable everyday jewelry, signet rings, hoop earrings
925 Sterling Silver 925 / 1000 Ag 10.36 g/cm³ 75 to 110 HV Bold fashion jewelry, heavy curb chains, cuff links
950 Platinum 950 / 1000 Pt 21.45 g/cm³ 120 to 140 HV High jewelry solitaire mounts, limited edition bezels
Manufacturing Protocol

Precision Processing Workflow

From raw ingot spectral audit to cleanroom quality inspection, our engineering workflow ensures strict metallurgical repeatability.

PHASE 01

Raw Stock Spectrometry Audit

Incoming billets undergo handheld XRF spectral testing and optical emission analysis to confirm chemical composition and low carbon/gas content before sawing.

PHASE 02

Multi-Axis CNC Machining

Components are machined on high-rigidity Japanese 5-axis machining centers with high-pressure synthetic flood coolant to prevent work hardening and surface micro-tears.

PHASE 03

Artisanal Finishing & Lapping

Components undergo specialized compound buffing, satin graining, and diamond micro-lapping to create distortion-free optical mirror bevels and crisp transition lines.

PHASE 04

Passivation & Biocompatibility QC

Finished components undergo automated ultrasonic degreasing, chemical passivation, and salt-spray testing to verify hypoallergenic skin contact performance.

Technical Guidance

Frequently Asked Questions

Common technical and manufacturing questions regarding this material grade, tooling requirements, and finishing capabilities.

Can Fullion provide certified assay hallmarking for precious metals?

Yes. All our precious metal outputs are alloyed to strict international standards and can be certified by accredited independent assay offices verifying exact gold, silver, or platinum millesimal fineness.

How do you eliminate porosity in cast gold and silver pieces?

We utilize computer-controlled vacuum induction casting machines with inert argon overpressure. By melting the metal in a vacuum and forcing it into investment flasks under gas pressure, molten turbulence and oxidation micro-voids are completely eliminated.

Can customers supply their own precious metal scrap or bullion?

Yes. We provide closed-loop casting and toll manufacturing programs for verified bullion and casting grain, providing detailed melt loss accounting and assay verification upon intake.

What protective coatings do you apply to 925 sterling silver to prevent tarnishing?

We offer multi-stage anti-tarnish options including electrolytic palladium barrier plating, bright rhodium plating (up to 0.1 µm), heavy 18K gold vermeil (up to 2.5 µm), and organic nanotech passivation.

Start Your Production Project

Bring Horological Precision to Your Decor Line

Send us your 3D concept designs, component blueprints, or sample references. Our engineering desk will deliver an exhaustive DFM analysis, tooling budget, and quotation within 24 business hours.

Submit Request for Quotation