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"Tiffany's decision to carry this litigation on after the District Court's decision doesn't do anything to combat counterfeiting," says an Ebay spokeswoman. "The best way to stop counterfeiting is ongoing collaboration between companies, government agencies and law enforcement."

Tiffany sued Ebay in 2004, alleging it turned a blind eye to the sale of fake jewellery on its website and calling it "a rat's nest of counterfeit goods."

But in July, all of its trademark infringement claims were rejected, and a federal judge held that brand owners are ultimately responsible for protecting their own trademarks.

Although Ebay scored a legal victory in the US case, it did not enjoy similar fortunes abroad.

A French court ordered the company to pay $61 million to luxury goods group LVMH, owner of the Louis Vuitton and Christian Dior brands, in compensation for allowing the sale of fake items on its website. EBay is planning to appeal.