How to test jewellery for cadmium?

These days a lot of jewellery is testing as containing dangerous levels of lead and cadmium, mostly Chinese imports.  How could a consumer test jewellery for cadmium, easily and cheaply at home, please?  I can't find anything online about how to test for cadmium.

No need to test. Buy your jewelry from reputable places.

Apparently you haven't been doing a good job searching. Cadmium Testing Kit is all you need to search for on Google and you get this:

http://www.home-health-chemistry.com/Cadmium-Test....

Most homes already likely contain some piece of jewelry that is contaminated. CBS news found in 2010 that most major retailers had been selling contaminated products, even Saks Fifth Avenue, arguably the most reputable of all. Only in 2011 did major retailers even agree to start checking for cadmium.

That home-health site looks a bit sketchy. I would love to know if someone has ordered from there.