Silver testing machine cadmium deviation

Hi,

I am looking for a econmical machine for testing silver percentage by
non-distructive method. I am only interested in testing silver
articles. I have checked different caratometers but there is one
problem, in India many silver articles are made by alloying cadmium
and the graph of cadmium and silver are very closer so the result is
not as accurat as it should be.

If someone assist me in this matter?
Thanks in advance.
Season"s Greeting, Pankaj Bakhai