The majority of the diamonds from Arenapolis (~70%) exhibit transport-related abrasion textures. A higher proportion of diamonds with radiation spots distinguishes the diamonds from Boa Vista from the other deposits. The concentrations and the aggregation states of nitrogen impurities in the diamonds, as well as in their carbon isotope compositions, are also similar. Sixty-eight alluvial diamonds from three placer deposits in Brazil (Arenapolis in the State of Mato Grosso, Boa Vista in the State of Roraima, and Canastra in the State of Minas Gerais) are characterized by similar crystal shapes, body colors, and surface textures, which are related to growth or resorption processes.
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