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Analytical Services

Morris and Watsons Analytical Services Department (Assay Laboratory) is an integral part of the business. Our mission is to determine and verify the four major precious metals used in the jewellery industry (Gold, Silver, Platinum and Palladium) which are contained in materials such as dore bars, alluvial gold, jewellery alloys and scraps and jewellery waste called lemels and sweeps.

We accomplish this by using internationally accepted procedures of Fire Assay by fusion and cupellation together with Atomic Absorption Spectrometry. 

We also use the latest X-Ray Fluorescence (XRF) technology which alloys the Assay Laboratory to perform a pre-screening test and quick verification of unknown alloys and lemel samples submitted by customers for refining. 

This is critical for deciding the correct inquartation with fine silver, prior to actual fire assaying. Inquartation is the method which ensures the best parting and/or separation of the target elements, resulting in the accurate determination of the precious metals.

Our offices also have XRF machines so quick checks and confirmations can be done if the material submitted is suitable to be analysed accurately using XRF. 

Refining Capture
Precious Metal Jewellery Refining Lemel Gold Silver Platinum Palladium Precious Metal Jewellery Refining Melting Gold Silver Platinum Palladium
Precious Metal Jewellery Refining Melting Gold Silver Platinum Palladium

The analytical procedures developed and used at Morris and Watson have demonstrated the high standard of precision and accuracy that have given satisfaction and confidence to so many customers over so many years. Proof samples are analysed with every single batch of analysis. To add further confidence in the analysis, replicate samples are analysed, as well as internal check samples, within each batch of determinations.

More importantly, all analytical services are performed by professional and highly qualified Chemists and Chemical Engineers with decades of combined laboratory analysis experience.

To render the most beneficial services to our paying (outside) customers, the Assay Laboratory works closely with other Departments as our internal customers. We assist the Chain Department in controlling the plating solutions quality and assaying all externally purchased gold and sterling silver findings.

The caratage in gold and sterling silver chains are verified and tested to ensure adherence to specifications. 

All gold and silver alloys granulated by the Vault and Fabrication departments, for use by the Casting department, are assayed to ensure compliance with internationally accepted fineness and specific requirements.

The largest of the Assay department's internal customer's is the Refinery Department. Frequent chemical analysis is needed to determine the concentration of precious metals at stages of the various refining processes.

The weighing, roasting and melting of the different types of materials for refining, follow international recognised sample preparation techniques, to enable the extraction of a truly representative sample for analysis. Virtually all main and spent refinery process solutions are monitored by sampling and assaying.

The assay department also provides accurate analysis in assisting other departments when it comes to assessing Morris and Watson's environmental compliance.

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© 2022 Morris and Watson
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OUR LOCATIONS
Auckland
Brisbane
Sydney
Bangkok
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QUICK LINKS
Login
Sign Up
View Cart
Upload STL
Bullion Live Prices
INFORMATION
Contact Us
About Us
History
Sitemap
RESPONSIBILITY
Terms of Supply
Privacy Policy
Website Terms of Use
Environmental Policy
Responsible Jewellery Council Policy

© 2022 Morris and Watson
All Rights Reserved