Natural Tanzanite gemstone is a mix of grey, green, brown, and blue colors. The gem achieves its blue color through heat treatment. Most of the Tanzanites we see in the market are heated. The big question is does Tanzanite Heat affect Tanzanite quality?
Heating can occur naturally before the gem is mined. The earth’s thermal vents have been heating Tanzanite deposits for millions of years hence some gems are mined being already blue in color. After mining, the gems are usually heat treated regardless, in order to remove any residual unwanted colors.
Natural Tanzanite gemstones can also be heat-treated to remove the brownish color and leave behind the blue and violet that we have all come to adore. Heating is done in temperatures ranging from 400 to 600 degrees centigrade for about an hour.
O Tratamento térmico da Tanzanite is very mild compared to the heat treatment of other gems like rubies and sapphires. Such gems can be heated to temperatures between 1000 and 1800 degrees centigrade and held at those temperatures for days or weeks.
Tanzanite’s color change through heating is not reversible and will remain unaffected by cutting and polishing. Be warned the color does not signify Tanzanite quality.
While heat treatment of Tanzanite may result in a more favorable color, it does not enhance the grade or value of the gemstone. If a piece of Tanzanite was medium-grade, heating will not enhance it to a top-grade Tanzanite. Heat treatment does not affect Tanzanite quality.
O valor da tanzanite continuará a depender de outros factores para além da cor. Estes são os 4 Cs de tanzanita. Along with color, there are Carat, Cut, and Clarity factors that determine the valor da tanzanite.
The heating does not change the original color of this pedra preciosa azul rara. Apenas remove o eixo vermelho/castanho e deixa para trás a cor desejada azul/violeta. Se a pedra era originalmente azul pálido, o aquecimento não a aumentará para um azul mais profundo.
Quando uma pedra de qualidade média, normalmente castanha clara, é aquecida, tornar-se-á azul pálido/violeta. Quando uma pedra de qualidade superior que é normalmente castanha profunda é aquecida, tornar-se-á um azul/violeta profundo após o aquecimento.
The main difference between a heated and unheated gem is the removal of the yellow color due to heating. However, it is known in the mining industry that some Tanzanite has been naturally heated and may show no yellow color when extracted.
Tecnicamente falando, todas as gemas são aquecidas. Quer através de aquecimento de ventilação térmica pré-mina ou pós-mina em joalheiros comerciais. Tratamento térmico é uma prática comum e é de esperar.
A prática remonta a séculos atrás. O tratamento térmico é basicamente uma continuação dos processos de aquecimento que ocorreram no solo. No tratamento térmico actual, as pedras são aquecidas a temperaturas muito elevadas, acelerando assim o processo de aquecimento que teria levado anos se as pedras fossem deixadas no solo.
Only a very small amount of untreated gems with perfect color are found in the mine. This type of naturally blue Tanzanite has a much greater demand in the market as they are rare.
Without heat treatment, the world would be with fewer colored gemstones. Heating allows us to change off-colored stones into beautiful-colored ones.
It is currently impossible to scientifically test the nature of the Tanzanite’s treatment, whether naturally heated or man-heated. Since all gems have been heated in one way or another, there is no effect on price. It is a common assumption that all gems have been heated at some point.
Com isto dito, oferecemos na nossa loja online uma variedade de jóias naturais da Tanzanite de primeira qualidade para que possa comprar à sua conveniência. Nós somos negociantes respeitáveis de tanzanite que minam, produzem e vendem apenas os produtos da melhor qualidade aos nossos clientes.
