Rio Tinto Releases Limited Edition Argyle Pink Diamond Ingots
By Erika Winters Rio Tinto has released limited edition pink-diamond ingots commemorating the Spring 2013 opening of the Argyle underground diamond mine. The one-ounce, 22k pink-gold ingots are each set with seven Argyle pink diamonds in the branches of a boab tree. The ancient boab tree is native to Wes...
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