Rio Tinto’s rare red, blue and pink diamonds debut in Hong Kong
09 September 2013 The world’s most exclusive diamond sale, the Argyle Pink Diamonds Tender, has debuted in Hong Kong, with 64 of the world’s rarest pink, blue and red diamonds. For the first time in the 30-year history of the Argyle Diamond Mine, Rio Tinto will be showcasing three Fancy Red diamonds at its annual …