Independent Precious Metals Assays You Can Settle On

Accurate, accredited gold, silver, platinum, and palladium analysis - trusted for commercial settlement,
dispute resolution, and verification for over 140 years.

140+ Years

of precious metals assaying

ISO 17025

accredited methods

LBMA Affiliate

Member (also IPMI & LPPM)

Independent

third-party results

Trusted Across the Precious Metals Value Chain

Refiners · Bullion traders & dealers · Financial institutions & investors · Mining & exploration · Electronics & e-scrap recyclers · Automotive & industrial catalyst processors · Jewelry manufacturers

From bullion to trace levels to high-grade material, our team delivers accurate, defensible results you can rely on for valuation, settlement, and verification. A surface XRF reading isn’t enough when real money is on the line. The right method depends on your material and the elements in question, which is why we work with you to choose the approach that delivers the analysis you actually need: ICP, fire assay cupellation, chemical titration, or gravimetric analysis.

Precious Metal Verification

Verify the authenticity and value of your gold, silver, palladium, and platinum investments with precise testing. Accurate composition analysis is crucial to determining the true worth of these precious metals, ensuring you know exactly what you own.

Hundreds of Years' of Experience

For over 144 years, we have been accurately analyzing our worldwide customers’ materials. We started out assaying gold and silver in the late 1880s. Today, our portfolio of precious metal assay services and methods are ISO 17025 accredited.

Why Companies Trust Ledoux With Their Most Valuable Material

Truly Independent

We test, we don’t trade. Our only stake in your result is its accuracy, which is what makes our assays defensible in settlements and disputes.

Accredited & Proven

ISO 17025-accredited methods, backed by a track record that began assaying gold and silver in the 1880s.

The Right Method

ICP, fire assay, titration, gravimetric — we match the technique to your material instead of forcing everything through one instrument.

From Sample to Certified Result in 4 Simple Steps

1.Request a quote or consult

Tell us your material and goal. We recommend the right method and confirm pricing and turnaround.

2. Submit your sample

Follow our guided process: handling, packaging, and chain-of-custody.

3. We analyze

Tested using the accredited method best suited to your material.

4. Certified report

Clear, defensible results for settlement, valuation, or verification.

What We Analyze

– Metals: Gold (Au) · Silver (Ag) · Platinum (Pt) · Palladium (Pd) · Rhodium & other PGMs

– Materials: Bullion & doré · Ores & concentrates · Spent and fresh catalysts · Electronic scrap & recycled materials · Industrial feedstocks & residues · Jewelry & manufacturing material

– Methods: ICP · Fire assay (cupellation) · Chemical titration · Gravimetric analysis

Don’t see your material listed? Ask us, we likely test it.

SEASONAL — SORRENTO 2026

Heading to the LBMA/LPPM Global Precious Metals Conference in Sorrento?

We’ll be following the conversations shaping the market this October. If you’re rethinking your assay or verification partner, let’s talk before Sorrento — book a no-obligation consultation and we’ll be ready to move when you are.

Conference runs 4–6 October 2026, Hilton Sorrento Palace.

140 Years of Results the World Has Trusted

Since the 1880s, the most important materials have passed through our lab. A few we’re proud of:

Statue of Liberty & Chrysler Building. Analyzed the copper used on the Statue of Liberty and the metals atop the Chrysler Building (and, it’s rumored, the cables of the Brooklyn Bridge).
The 1969 moon landing. Entrusted with moon rocks and lunar vehicle metal.
The Manhattan Project. Monitored the Hudson River for radioactive elements.
The Atocha. Authenticated coins from a Spanish galleon sunk off Florida in the 1600s, and verified pre-Columbian artifacts.
Harper’s, 1896. Certified that Rae’s Olive Oil was unadulterated.

The same rigor we brought to those materials, we bring to yours.

Know Exactly What Your Metal Is Worth

Accredited, independent results — backed by 140 years of trust. Tell us what you need and we’ll recommend the right approach.

Questions first? Talk to an expert.

FAQs – Precious Metals Analysis

1. What precious metals can be tested?

Precious metals testing commonly includes analysis of:

Gold (Au)
Silver (Ag)
Platinum (Pt)
Palladium (Pd)
Rhodium and other platinum group metals (PGMs)

These metals are widely used in industries such as electronics, automotive catalysts, jewelry manufacturing, and metal refining.

2. What analytical methods are used to test precious metals?

We may use several advanced analytical techniques depending on the sample type. These methods include:

Inductively Coupled Plasma (ICP) analysis
Fire assay (cupellation)
Chemical titration
Gravimetric analysis

The appropriate method is selected based on the material being tested and the elements that must be measured.

3. What types of materials can be analyzed for precious metals?

Precious metal analysis can be performed on a wide variety of materials, including:

Catalysts from automotive and industrial processes
Metal ores and concentrates
Electronic scrap and recycled materials
Industrial feedstocks and residues

Testing helps determine both metal content and potential recovery value.

4. Do you provide independent verification of precious metal content?

Yes. We provide objective testing and verification of metal content, helping companies confirm analytical results, avoid disputes, and support technical evaluations.

5. How can I submit samples for precious metals analysis?

To submit samples, please click here. We will guide you through the process and recommend the appropriate analytical methods.