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Rem: Revista Escola de Minas

Print version ISSN 0370-4467On-line version ISSN 1807-0353

Abstract

CHAVES, Mario Luiz de Sá C.  and  CHAMBEL, Luís. Diamantes do médio rio Jequitinhonha, Minas Gerais: qualificação gemológica e análise granulométrica. Rem: Rev. Esc. Minas [online]. 2004, vol.57, n.4, pp.267-275. ISSN 0370-4467.  http://dx.doi.org/10.1590/S0370-44672004000400009.

The Jequitinhonha River basin alluvial deposits, in Minas Gerais, were the source of most of the Brazilian diamond production since 1714 until the last middle eighties. This historical and economical importance is in itself a reason to publish grain-size and gemological quality data concerning the diamonds of the Tejucana and Rio Novo mining companies concession areas. In addition, extensive sampling (186,052 stones or 17,689 ct) on 14 locations along the river can contribute to create an important database to identify the origin of different diamond populations. Among other observations, the high proportion (82,2%) of gem diamonds should be stressed.

Keywords : Jequitinhonha River; diamond; grain-size distribution; gemological quality.

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