 | | Journal (issue) | | Windmill-cut topaz from Namibia|Tourmaline from Masisi, DRC|Yellow tourmaline from Mavuco, Mozambique|Tremolite...Articles 708 Coloured Stone Mining and Trade in Brazil: A Brief History and Current Status By Aurélien...Collection V. L. Villani photo p. 758 Cover Photo: Brazil is the source of a variety of coloured stones,...ct Swiss Blue topaz, 7.99 ct amethyst, 3.29 ct tourmaline, 2.40 ct aquamarine, 1.12 ct Imperial topaz and... honey-colour chrysoberyl and Paraíba-colour tourmaline. Each includes a definition, history, research |  | | Journal (issue) | | (3) a 1.53 pink diamond from Argyle, courtesy of Rio Tinto; (4) an 11.16 ct sapphire from Madagascar,...Collection no. 32510; and (8) a 13.94 cuprian elbaite tourmaline from Mozambique, courtesy of Pala International...market was down to 42% by value and 29% by volume (Rio Tinto Diamonds, 2008). It had unloaded its diamond... PRODUCTION AND MARKETS Rio Tinto. In 2003, London-based mining giant Rio Tinto opened Canada’s second...second diamond mine, Diavik, with 60% ownership. Rio Tinto had established its own rough diamond sales channel |
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