The World Cup in Brazil opened today, and the "Paliba", a shining gem originating in Brazil, has once again attracted the attention of jewelers. This jewellery industry "being young," since its first appearance in 1989, has quickly established itself in the gem world, and has become the king of the tourmaline. The value of the collection has increased, and its reputation has been rising...
璀璨碧玺 has a long history
Brazil has been rich in gemstones since ancient times, and its rich mineral resources have attracted a batch of prospectives. In 1981, a Brazilian gemstone miner named Heitor Dimas Barbosa did not know where to come from, and he believed that the unknown gems were buried in the hills of Paraiba, Brazil. He began to dig holes from an abandoned mine, but there was no result. He continued to dig for five years and finally found the possibility of the existence of tourmaline in some caves.
Until 1989, in the Minada Batalha mine in the village of Sao Josede Batalha, ParaÃba, Brazil, an unusually bright crystal was discovered by the explorers – weighing 10.5 grams, with extremely high copper and manganese content, and very rare bright colors. . As a result of excavation from Paraiba, this stunning tourmaline was named "ParaÃba Tourmaline". At the Tucson Gem Show in the second year, Paraiba Tourmaline made its debut. In just four days, the price soared nearly 10 times, and it created a miracle at that time.
"ParaÃba" famous world
The quality of Paraiba tourmaline is very rare and the price is close to diamonds. At the end of 1989, the gem exploration team led by Heitor and Barbosa discovered a blue-green tourmaline containing copper in the province of Paraiba in northeastern Brazil. Its color is very bright and can shine with neon light. This caused a sensation in the gemstone circle at the time. In 2000, new veins of this beautiful blue-green tourmaline were discovered in Mozambique and Nigeria. In 2007, the prestigious LGHC in the gem world officially named the tourmaline, which is mined in Brazil, Mozambique and Nigeria, with the copper element, the “Paraiba†tourmaline.
According to this point of view, the place of production is not limited to the province of Paraiba in Brazil. As long as the tourmaline contains a certain amount of copper, it can be called Paraiba tourmaline. However, some collectors now only recognize the copper tourmaline produced in the ParaÃba region of Brazil as Paraiba. However, what makes them feel embarrassed is that at present, several major gemological laboratories in the world cannot provide the origin of tourmaline. In the existing gemstone certificate, the identification of tourmaline does not distinguish the origin, so even ParaÃba tourmaline from Paraiba may be purchased from other places.
How to identify "Paraiba"
Paraiba is usually blue-green, saturated in color and light in color, but not all blue-green tourmalines are called Paraiba. Is it the ParaÃba that contains copper? According to the definition of LMHC, the world's most authoritative appraisal agency, a blue (electro-optic blue, neon blue, purple blue), blue-green, green-blue or green tourmaline containing copper and manganese, regardless of where the origin is, It can be called Paraiba Tourmaline.
Different gemstone materials or gems and glass are sometimes mixed in the market to pretend to be Paraiba, but Paraiba is a tourmaline with unique electro-optic, which cannot be simulated by counterfeit goods. Investors can use a refractometer to determine the refractive index value of tourmaline. ParaÃba has a refractive index between 1.62 and 1.64 and a birefringence of 0.018. Other optimized treatment methods include heat treatment, dyeing, filling, irradiation and film treatment.
There are many foreign appraisal institutions, and the evaluation criteria are different. For example, some laboratories believe that only the copper-containing tourmaline produced in the ParaÃba region of Brazil is ParaÃba tourmaline, and some laboratories believe that as long as the copper-containing tourmaline is It is Paraiba Tourmaline. The difference in results and ratings of the same product in different laboratories is likely to be large. At present, the most authoritative color gem identification institution in the world is the Gubelin Gem Laboratory, the Swiss Guerre Gem Laboratory. The color gemstone jewelry with the ancient Berlin certificate has a high reputation.
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