Background: Guastadisegni, 42, was 14 years old when his family moved from Italy to Chicago. He studied mechanical engineering at the University of Illinois at Urbana-Champaign, and studied ...
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World's largest cut diamond carved from mysterious stone harder than regular gems
A mysterious black diamond stumped experts for years until one Belgian cutter invented a new machine to shape the 612-carat gem into the world's largest.
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