Brazilian Gems


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Brazilian Gems


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Brazilian Gems


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Brazilian Regions
This is Brazil
What is new
Search Help
Contact Information

Brazilian Gems


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Brazilian Regions
This is Brazil
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PEDRAS BRASILEIRAS

 

O Brasil destaca-se no cenário internacional como o principal produtor de pedras preciosas da atualidade, especialmente de gemas coradas (coloridas). Os estudos geológicos, aliados aos registros históricos de produção, desde a época colonial, indicam que o território brasileiro detém inúmeras reservas de importância estratégica para a nação, tais como: esmeralda, crisoberilo, alexandrita, turmalina, água-marinha, topázio imperial, kunzita, granada, ametista, citrínio, ágata e opala. Pode-se destacar dentre as gemas coradas brasileiras de maior valor e atratividade para os joalheiros, admiradores e investidores de todo o mundo: a alexandrita, o crisoberilo olho-de-gato e a indicolita.

ALEXANDRITA (Óxido de Berílio e Alumínio: Br Al2 O4)

É uma variedade de crisoberilo e merece destaque pela sua propriedade especial de mudança de cor, conforme a natureza da luz incidente: à luz do dia é verde como a esmeralda e à noite (luz incandescente) é vermelha como o rubi. Originalmente descoberta na Rússia, seu nome é uma homenagem ao Czar Alexandre II. Atualmente é produzida, no Brasil, em três regiões principais: Hematita - MG (a mais importante), Carnaíba - BA e Minaçu - GO.

CRISOBERILO OLHO-DE-GATO (Óxido de Berílio e Alumínio: Br AI2 04)

Assim denominado pelo efeito "chatoyance" produzido por inúmeros canais vazios ou fios capilares de amianto distribuídos paralelamente ao longo do seu eixo. Esse fenômeno centraliza uma faixa luminosa prateada na superfície da gema lapidada em talhe cabochão, fazendo lembrar a íris dos olhos dos felinos. Quanto mais perfeito o fenômeno, mais valor tem a gema. Os olhos-de-gato ocorrem principalmente na região de Padre Paraíso, em Minas Gerais.

INDICOLITA (Borossilicato Complexo de Alumínio de Composição Variável: (Na, Ca, K) (Mg, Al, Fe2+, Fe3+, Li, Mn)3 (Al, Cr, Fe3+, V3+)6 (Bo3)3 Si6 018 (OH,F)4

De cor azul-índigo (o nome provem do grego indikós), éde ocorrência pouco comum, o que torna essa variedade de turmalina uma das gemas mais cobiçadas por colecionadores. E encontrada na região de Araçuaí-ltinga, Zona do Rio Piauí (lavra dos pirineus), no Estado de Minas Gerais e nos Estados da Paraíba e do Tocantins.

WALID EL KOURY DAOUD Diretor Técnico do Museu Nacional de Gemas - Brasília -DF BRAZILIAN GEMS

 


 

Brazil has been internationally regarded as the main producer of gems, specially colored ones. Since colonial times, geological studies, coupled with production historical records, have shown Brazilian territory bears several reserves of nationally strategic importance, such as: emerald, chrysoberyl, alexandrite, tourmaline, aquamarine, imperial topaz, kunzite, garnet, amethyst, citrine, agate and opal. Now, we must spotlight the Brazilian gems of highest value and attractiveness for jewelers, admirers and investors from around the world: alexandrite, cat's eye chrysoberyl and indicolite.

ALEXANDRITE (Beryllium Aluminum Oxide: Br AI2 O4)

This is a variety of chrysoberyl which is famous for its special property to change colors, according to the striking light: at daylight, it is green like an emerald and at night (artificial light), it is red like a ruby. Originally found in Russia, its name is a tribute to Czar Alexander II. Nowadays, it is produced, in Brazil, in three main areas: Hematita/MG (the most important one), Carnaíba/BA and Minaçu/GO.

CAT'S EYE CHRYSOBERYL (Beryllium Aluminum Oxide: Br AI2 04)

This gem is thus named for the chatoyant effect produced by its countless empty channels or amianthus capillaries which run in parallel along its axle. This phenomenon centralizes a luminous silvery stripe on the gem surface cut in cabochon style, making it resemble the iris of a cat's eye. The more perfect the phenomenon, the more valuable the gem is. Cat's eyes are mainly found in Padre Paraíso/MG.

INDICOLITE (Borosilicate Complex of Variable Composition Aluminum: (Na, Ca, K) (Mg, Al, Fe2+, Li, Mn)3 (Al, Cr, Fe3+, V3+)6 (Bo3)3 Si6 018 (OH,F)4

This indigo blue gem (its name is from the Greek indikós) is rarely found, what makes this variety of tourmaline one of the most eagerly wanted gems for collectors. It is found in the Araçuaí-ltinga area, Rio Piauí (pirineus mine)/MG, and in the States of Paralba and Tocantins.

WALID EL KOURY DAOUD Technical Director of the National Museum of Gems - Brasília-DF

 


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 Copyright 2012 notice: Please note that most material on this site is copyrighted, if pieces and bits of this site is found in other locations without proper authorization there are happy lawyers that would be glad to contact you. If you would like to use some pictures, contents of this site, please contact author first
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Last updated: 12/22/11.


Home | Brazilian Regions | This is Brazil | What is new | Search Help | Contact Information

 Copyright 2012 notice: Please note that most material on this site is copyrighted, if pieces and bits of this site is found in other locations without proper authorization there are happy lawyers that would be glad to contact you. If you would like to use some pictures, contents of this site, please contact author first
For problems or questions and advertising regarding this Web site contact email vivabrazil.
Last updated: 12/22/11.


Home | Brazilian Regions | This is Brazil | What is new | Search Help | Contact Information

 Copyright 2012 notice: Please note that most material on this site is copyrighted, if pieces and bits of this site is found in other locations without proper authorization there are happy lawyers that would be glad to contact you. If you would like to use some pictures, contents of this site, please contact author first
For problems or questions and advertising regarding this Web site contact email vivabrazil.
Last updated: 12/22/11.


Home | Brazilian Regions | This is Brazil | What is new | Search Help | Contact Information

 Copyright 2012 notice: Please note that most material on this site is copyrighted, if pieces and bits of this site is found in other locations without proper authorization there are happy lawyers that would be glad to contact you. If you would like to use some pictures, contents of this site, please contact author first
For problems or questions and advertising regarding this Web site contact email vivabrazil.
Last updated: 12/26/11.