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“Paraiba” Tourmaline

Alto Ligonha, near Nampula, Mozambique From an alluvial deposit in the remote reions of the Alto Ligonha region of Mozambique, approximately 300 miles from Nampula, comes this very large vibrant-hued gem tourmaline. The deposit, which was only found four years ago, is one of copper-bearing or cuprian tourmaline. After much debate, the world’s major laboratories have now agreed to use the coveted term “paraiba” to describe the most vivid hues of copper-containing tourmaline—particularly for those blues which are described in the trade as being “Caribbean” blue—regardless of the country of origin. The designation of “paraiba” was previously only permissible for those stones which actually originated at the São José da Batalha mine in the state of Paraiba, Brazil. It would be difficult to imagine a finer stone from this locality, with its attractive sea blue-green color this very fine gem displays an exemplary clarity and luster for the species. Weighing approximately 95.82 carats and measuring 31.5 x 25.

Date de cette photo: 13 juillet 2008
Publié par: Alain Truong

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