India’s product has generally not been regarded as high enough quality by Japan’s demanding buyers, who have preferred top-tier producers like Rio Tinto, Alcoa and South32 as well as United Company Rusal.
A rare violet diamond, the largest of its kind ever found at Australia's remote Argyle mine, will be the centrepiece of Rio Tinto's annual pink diamonds showcase, the company said Tuesday.
A merger would have created the world's biggest miner, supplanting BHP Billiton.