A selection of the finest rough diamonds from Rio Tinto’s Canadian and Australian mines will be tendered to diamond specialists from around the world in October and November. Headlining Rio Tinto’s forthcoming “Specials” Tender, which showcases rough diamonds greater than 10.8 carats, is Lot number 1, Diavik Helios, a 74.48 carat Fancy yellow diamond. The … Continue reading Last special roughs from Argyle in Rio Tinto tender