Rio Tinto mine in Western Australia sold a 1.21 ct red diamond for a record price, the miner won’t disclose the price of the radiant cut rare red diamond, but said the total price for Argyle pink diamonds has tripled over the past decade.
Named the Argyle Cardinal, the diamond is one of 13 red diamonds larger than one carat, and one of 54 pink and red diamonds sold at the latest international tender.