On a hot sunday in 1999 three miners find a thin, triangular stone in a muddy Brazilian river. As Matthew Hart tells it in his captivating new book, Diamond (Walker, $26), they rush the pink rock, which measures an inch and a half on its longest side, to a truck-parts shop in the city of Patos de Minas. The shop also trades in rough diamonds, and the moment Gilmar Campos, one of the owners, takes a look at the stone, he starts to cry.
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