Rare rough ruby goes on show in Dubai ahead of auction
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The 8,400-carat stone -- nicknamed Burj Alhamal and weighing 2.8 kilogrammes (over six pounds) -- was mined in Tanzania and made its debut at a Dubai hotel on Friday as part of SJ Gold and Diamond's Callisto collection.
The company says it is "one of the biggest" rough rubies in the world, with managing director Patrick Pilati calling it among the "rarest rubies ever found".
He said the Tanzanian stone was "not heated", meaning "it has not been treated, so it's natural and that's why it's precious."
Late last month, a giant diamond nicknamed "The Rock" went on display for the first time in Dubai.
The 228.31-carat pear-shaped gem, which was mined and polished in South Africa more than 20 years ago, is the largest white diamond ever to come to auction, according to Christie's.
The diamond is expected to fetch over $30 million.