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Independent, ISO 17025 accredited laboratory analysis for gold and rough diamonds. Fire assay, XRF, ICP-MS spectrometry — the definitive methods for commercial settlement.
We coordinate comprehensive analytical services through internationally accredited laboratories. Our partner facilities provide testing for all precious metals and minerals — from exploration samples through to commercial settlement.
Laboratory expertise includes classical assay methods such as gravimetric (wet chemistry) and fire assay, as well as instrumental techniques including Inductively Coupled Plasma (ICP-OES/ICP-MS) and X-Ray Fluorescence (XRF).
Every test result is legally binding and admissible for commercial settlement, insurance claims, and customs valuation.
Definitive determination of gold content for buy/sell transactions with legally binding results.
Independent third-party testing to resolve disputes when buyer and seller results differ.
Complete sample tracking from collection through testing to certificate issuance.
International laboratory quality standard
London Bullion Market standards
Independent quality assurance
Admissible for settlement & customs
Different testing methods serve different purposes. Here's what each involves and when it's used.
The definitive "referee" method for determining gold purity. Used worldwide for commercial settlement.
X-Ray Fluorescence provides rapid, non-destructive elemental analysis. Ideal for screening.
Inductively Coupled Plasma Spectrometry for trace element detection at PPM/PPB levels.
Classical wet chemistry method using precipitation and weighing for comprehensive analysis.
Archimedes principle testing to detect tungsten cores or other counterfeiting methods.
Independent third-party analysis when buyer and seller assay results disagree.
Fire assay has been the definitive method for gold determination for over 500 years. It remains the "referee" method used by refineries, central banks, and trading houses worldwide.
The method completely separates gold from all other elements through a series of high-temperature fusions and chemical separations, then weighs the pure gold remaining.
The sample is mixed with flux containing lead oxide, borax, and silica, then heated to 1,000°C+.
The lead button is heated in a porous cupel. Lead oxide is absorbed, leaving a "prill" of gold and silver.
Silver is added to achieve a 3:1 ratio. The alloy is dissolved in nitric acid, leaving gold intact.
The remaining pure gold is washed, annealed, and weighed on a precision microbalance.
The most precise method for gold determination
Fire assay is required by LBMA Good Delivery rules and accepted by all major refineries worldwide.
ISO 17025 Accredited Laboratory
Every assay certificate from our partner laboratories contains the information required for commercial settlement, customs clearance, and insurance purposes.
Professional evaluation of rough diamonds through accredited gemological laboratories.
Assessment of optimal cutting strategy and expected yield from rough stones.
D-Z color scale evaluation and detection of fancy colors or treatments.
Internal characteristics mapping, inclusion identification, and clarity potential.
Precision weighing and documentation for customs and valuation purposes.
From sample collection to certificate delivery — here's the typical process.
Secure collection with chain of custody
Insured transport to accredited facility
Fire assay, XRF, ICP-MS analyses
Quality assurance and certificate prep
Official assay certificate delivered
To be clear about what we do and don't do regarding laboratory testing.
Fire assay completely separates gold from all other elements and weighs the pure gold remaining. This gravimetric finish provides the highest accuracy.
XRF is excellent for screening but only analyzes the surface. For commercial settlement, fire assay is required because it tests the entire sample.
We can arrange umpire (arbitration) analysis through an independent third laboratory. Results are legally binding under LBMA rules.
Fire assay typically requires 30-50 grams. XRF can work with any size. For large lots, multiple samples are taken and averaged.
Yes. We work with externally audited, ISO 17025 accredited laboratories that operate independently. We have no interest in results.
Yes. You can select from our network of partner laboratories, or specify a particular facility if you have a preference.
We'll coordinate professional testing through accredited laboratories and ensure you get legally binding results.