Rio Tinto Group (ASX:RIO) discovered one of the largest gem-quality yellow diamonds in Canada, weighing 158.2 carats, from its Diavik diamond mine in the Northwest Territories, the miner said in a statement Tuesday.
The mine's production mainly consists of white diamonds, with less than 1% yielding rare yellow diamonds, the statement said.
Shares fell 2% in morning trade Wednesday.
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