$400 Million Emerald Mystery It has a complicated and unfathomable history - will the authorities ever find an owner for the Bahia Emerald -- or will it prove just too powerful to shift? Find out in $400 Million Emerald Mystery and explore the gemstone's colourful history and analyse the different claims over it. The unearthing of what may be the world's largest emerald in Brazil is a truly remarkable story, but the staggering eight-way battle for its ownership is almost too astonishing to believe. Found in a Bahia mine in 2001, the remarkable stone, valued at $400 million, has since endured a bizarre odyssey, from an abandoned petrol station in San Jose to a submerged vault in Hurricane Katrina-ravaged New Orleans. With the gemstone trade a world of mystery and intrigue, the 840lb (381Kg) specimen has already changed hands in a Sao Paulo car park, been used as collateral in a diamond deal and even shown up on eBay!