"They need to clearly indicate to the market what their strategy around Olympic Dam is, around shale gas, all of these things, to return confidence that they're not spending huge amounts of capex for very low returns."
India's polished diamond trade saw a sharp decline in February following the imposition of a2% import duty by the Indian government on polished diamond imports on January 17, 2012.
London-based diversified miner Rio Tinto (LON:RIO) is taking a page out of BHP Billiton's playbook and is looking at selling some or all of its diamond mines.