The Mt. Mica area in southwestern Maine has been mined for tourmaline and other pegmatite gems since the 1820s.
Read More“Paraíba” tourmalines continue to be recovered in small amounts from north-eastern Brazil.
Read MoreInclusions of native copper and tenorite (CuO) were found in greyish-green elbaite from São José da Batalha, Paraíba, Brazil.
Read MoreUnusually vivid tourmalines from the state of Paraiba, in north-eastern Brazil, have attracted great interest since they first appeared on the international gem market in 1989.
Read MoreThe Elahera gem field currently provides approximately 35% of the gemstones exported from Sri Lanka.
Read MoreAn overview of the plentiful and various gem materials being discovered and produced in Afghanistan.
Read MoreA further article exploring tourmaline mines in another part of Minas Gerais.
Read MoreA new source of red tourmaline is identified in Zambia.
Read MoreThis second article in the series on Minas Gerais describes the major tourmaline deposits which produce some of the finest specimens ever seen.
Read MoreAn overview of the many types of gem-quality material, and its inclusions, currently found in Sri Lanka.
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