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. After weeks of assessment, the Argyle Violet was polished down to a 2.83 carat, oval-shaped diamond. "Impossibly rare and limited by nature, the Argyle Violet will be highly sought after for its beauty, size and provenance," Rio Tinto Diamonds general manager of sales, Patrick Coppens, said in a statement.
