In recent years, X-ray technology has been used to test tungsten carbide rings with good results. An X-ray metal analyzer can identify the fineness of the metal in tungsten jewelry. It can even identify the metals used in the alloy. The process is relatively fast (it usually takes about five minutes to get the results), accurate (not quite as accurate as fire assaying, but very close), and – best of all – non-destructive.
X-ray metal analyzers focus and X-ray beam on the sample. The machine analyzes the information it gathers from the behavior of the beam, and then prints a report that identifies the elements and fineness of the sample.
The test results can be affected by the thickness of the plating if black tungsten filled and rolled black tungsten ring pieces. The result would be an unusual reading in the final report, which tells a skilled operator there is a problem with the item.
Like fire assaying, you won’t find this testing of tungsten carbide rings in a jewelry store. The equipment is costly, and it does take some expertise to analyze the results.
In the United States the Jewelers Vigilance Committee (JVC) offers this testing service.
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