(1) color
In the international market, the price of the bright red and bright blue tourmaline is the highest, and the red and green two-color and rose-red, emerald green tourmaline is also very popular in the market, and the price is higher. In the choice of inlaid tourmaline jewelry, the color is even and beautiful; in the necklace and bracelet, the color is better, the color of each bead can be different, with red, yellow, blue, green, purple and other colors; charm Pandora's color is more abundant, and more valuable is that there are two or more colors appearing on the same tourmaline, that is, two-color tourmaline or multi-color tourmaline, and the inner-infrared green watermelon tourmaline is also more precious; in addition, the tourmaline cat eye belongs to tourmaline. The top grade.
(2) Clarity
The black tourmaline is relatively brittle and prone to cracks. At the same time, it contains a large number of inclusions. The presence of a large number of cracks and inclusions will affect the transparency, color and fire of the tourmaline. The inner pure tourmaline is also rare. . When picking, try to pick the inside clean.
(3) Cut
The cut of the black tourmaline refers to the accuracy of its cutting ratio and the perfection of the finish after finishing. The shape design of tourmaline must firstly maintain the weight of the original stone according to the cleavage, quality and weight of the original stone, and dissect the original stone structure in the best state; and ensure the restoration of the color after the tourmaline is cut, showing the most beautiful Color, and then use the best method to deal with the original stone ç‘•ç–µ, to design the best tourmaline shape. For example, it is very important how some catfish with cat-eye effects make it fully express its special effects. A good cut should reflect the brightness and fire of the tourmaline as much as possible.
(4) carat weight
Black tourmaline weight is calculated in carats. Under the condition that other conditions are similar, as the weight of tourmaline increases, its value increases geometrically; the tourmaline with the same weight will have a far-reaching value due to the difference in color, clarity and cut.
(5) Transparency
Black tourmaline requires crystal clear, the more transparent the better the quality, do not have obvious fog or opacity, the higher the transparency, the higher the price.
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