Municipal market managers have found carcinogens in samples of Chinese jewelry smuggled to two major Ho Chi Minh City markets, the officials said in an announcement this week.
They checked four shipments of waxed and plated Chinese jewelry at An Dong Commercial Center and Hoa Binh Market in District 5.
About 93 percent of the goods were found to contain lead and cadmium, which can cause cancer, the local newswire Vietnamnet reported.
The chemicals are banned from use in jewelry in China.
Most of the shipments were unlabeled, did not have clear origins and many items were packed in large plastic bags.
The sellers could not produce their business licenses either.
Last month, market managers seized thousands of pieces of undocumented jewelry items made in China, including bracelets, earrings, and rings, from Binh Tay Market in District 6. The goods contained lead and cadmium.
Shops found selling the items were fined and the jewelry destroyed.
According to city authorities, a large amount of Chinese jewelry still remained on the market in the city, usually at small shops and wholesalers.
Market managers are still inspecting points of sale in districts 5 and 6.
Studies found that both lead and cadmium can accumulate in human body, causing kidney decline and cancer.
The chemicals can damage brain and bone development in children.
News of Chinese children's jewelry laced with cadmium in the US raised fears among Vietnamese consumers late last year.
According to media reports, retail giant WalMart had pulled bracelet and pendant jewelry lines from its stores while Chinese authorities launched an investigation of several jewelry exporters suspected of exporting cadmium-laced jewelry to the US.