Different types of tourmaline
Red treasure tourmaline
As the name suggests, Hongbao Tourmaline is a ruby-colored tourmaline. Since most of the red tourmalines have some brown tones, the overall color of the gemstones is dark. Therefore, among the red tourmalines of many different shades of red, the red treasure tourmaline is rich. Bright colors stand out.
Ruby color tourmaline not only beautiful, it also has a certain rarity, its low production, and generally contains many impurities, so the real crystal clean and bright ruby color tourmaline is very little to see.
Plum blossom
Plum blossom tourmaline, a kind of tourmaline.
Although the name of plum blossom tourmaline is good, it belongs to the middle and low grade tourmaline, and the price is not expensive. The plum blossom tourmaline has a certain color between the gem-quality tourmaline and the tourmaline, but the clarity and texture are extremely poor, almost opaque. If some of the pied-like color distribution has a hint of beauty, the plum blossom tourmaline is really to be broken. The ranks of tourmaline are gone.
The color of plum blossom tourmaline is generally mixed with white and red, intertwined, like the abstract plum pattern, looks good in appearance, plus its cheap price, is loved by some female friends. The editor's opinion here is that such a tourmaline does not have a collection value, but it is also possible to enjoy it. It is not allowed to compare it with a gem-quality tourmaline, so as not to be deceived and buy high-priced low-priced goods.
Purple tourmaline
Purple tourmaline, English name: Siberite, is a kind of tourmaline, tourmaline is also called tourmaline, is a kind of gemstone, tourmaline is very rich in color, almost all kinds of colors. Members of the Tourmaline family have the same basic crystal structure, but the colors are different, and purple tourmaline is one of them.
Purple tourmaline is a tourmaline with purple tones, such as light purple, deep purple, and purple.
It is purple due to manganese.
White tourmaline
Aceroite is a colorless or milky white tourmaline. White tourmaline is poor in color, has many cracking effects, and is rarely used as a gemstone. Unless there is a cat's eye phenomenon, it has a very low probability and is superior in quality to any kind of tourmaline. Also because of the many white tourmalines that are resisted, it also directly leads to its price disadvantage.
Huang Bizhen
Yellow tourmaline yellow tourmaline is generally divided into medium yellow, orange yellow, brown yellow. Yellow is a distinguished color in China, because in ancient China, yellow was a color that represented the imperial power.
It is difficult to see the pure color of the yellow tourmaline, in general, the yellow tourmaline on the market is dark yellow near brown. The color of the orange-purple tourmaline is relatively more reddish, not like oranges. The boundaries of orange-blue tourmaline and orange-red tourmaline are sometimes not very clear, mainly depending on which color is heavier on the stone. Orange tourmalines are generally listed separately in the market without being divided into yellow or red. The market price of orange tourmaline is moderate, and its color texture is also better.
The yellow tourmaline is extremely rare. The medium yellow tourmaline is mainly produced in Malawi in the south of East Africa. This yellow tourmaline occasionally has a slight green color in the pure yellow. The best of the yellow tourmaline is Malawi. Produced "Canary". This beautiful yellow tourmaline is bright and pure, with only the finest green luster in pure yellow and a delicate lemon scent. It is the most valuable of the yellow tourmalines. The value of the medium yellow tourmaline is extremely high, and now the market price is below Paraiba, but it is much higher than the red and blue tourmalines.
Paraiba Tourmaline
Paraiba tourmaline is a kind of tourmaline, compound boroic acid with a specific gravity of 3.06, a refractive index of 1.62-1.64, a birefringence of 0.018, a Mohs hardness of 7-7.5, and a composition of various metal elements such as copper and manganese. Trigonal/hexagonal crystal system, no cleavage, staggered or shell-like fracture, glass luster, purine array purification.
In 1989, the team led by the gemologist Heitor Dimas Barbosa, after years of exploration and excavation, was discovered in Paraiba, Brazil, and was named Paraiba.
Cat's eye tourmaline
Cat's eye tourmaline, as its name suggests, is named for its appearance resembling the cat's eyes. It is the best in the tourmaline. In fact, it is accurate to say that "cat eye tourmaline" is not the name of a gem, but an optical phenomenon on some gemstones. That is, when the hemispherical gemstone is irradiated with strong light, a thin and bright reflection will appear on the surface, which is called "cat's eye flash" or "cat's eye light".
In the concept of the average person, the cat's eye tourmaline is more precious, in fact, not necessarily, depending on what cat's eye is, it depends on its quality and size. Large particles, weighing more than 10 carats, and transparency are very precious. Cat's eye flash is usually yellow-white, and it is very precious if there is a red color such as red. What is even rarer is that when the cat's eye tourmaline is illuminated by a light source (such as direct sunlight or a flashlight), two cat's eye flashes, one white and one red, are extremely precious.
Therefore, when you choose to buy cat's eye tourmaline, you must understand its unique characteristics, do not blindly pursue the "cat's eye", because we buy after all is cat's eye tourmaline instead of "cat's eye".
Watermelon tourmaline
Watermelon tourmaline is in a spar. It has the characteristics of red inside and blue green outside. It is similar to the tourmaline of watermelon. Because of its name, the quantity is rare, so the price is more expensive. It is said that the bottom of the pillow of the Empress Dowager Cixi is watermelon. Tourmaline.
Refractive index 1.62-1.64
Birefringence: 0.018
Origin: distributed in South Africa, eastern Africa, Brazil and other places, China's Xinjiang Altay region.
Black tourmaline
Black tourmaline is rich in color, and black tourmaline is the most common color. Because of its large output and relatively low grade, the price is relatively low. However, the black tourmaline has the effect of warding off evil and is therefore very popular.
Polychromism: Strong. Red and pink: red and yellow red; green: blue green and yellow green to dark brown green; blue: light blue and dark blue; yellow green: blue green and yellow green to brownish green.
Refractive index: 1.624~1.644; black can be as high as 1.727~1.657.
Birefringence and dispersion: birefringence: 0.020; dispersion: 0.017.
Singularity: cat's eye and discoloration; discoloration is brownish red and yellowish green.
Ultraviolet fluorescence: pink has weak purple fluorescence, others are not or difficult to see.
Absorption spectra: blue and green: almost all absorbed from the red zone to 640 nm, only a strong and narrow blue-green band at 498 nm; red and pink: a wide green band with blue lines at 458 and 451 nm.
Inclusions: Red and green often contain irregular linear gas-liquid inclusions.
Stability: In case of strong heat melting, sudden temperature changes will rupture. Not subject to acid and alkali erosion.
Special properties: piezoelectricity and coke (thermal) electrical properties, friction can be charged.
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