While there are no federal requirements for testing cadmium in children's jewelry, some companies have started voluntarily reviewing the issue since the AP reported that some Chinese manufacturers substituted cadmium when a 2008 federal law effectively banned lead from children's jewelry.
Testing published by AP in January showed some jewelry was as much as 91 percent cadmium by weight, and that high levels could reach out of items when run through a test that mimics what would happen if a child swallows a cadmium-laced piece.
On Tuesday, CPSC spokesman Scott Wolfson reiterated the agency's warning to Asian manufacturers "not to substitute cadmium in place for lead."
Wolfson said agency staff is developing a "highly protective" standard for cadmium in children's products, but he said it is undergoing scientific review. The agency now applies a legal guideline that simply allows action against "hazardous levels," without setting specific levels, he said.