The quality evaluation of tourmaline can be carried out from the aspects of weight, color, clarity and cut. Among them, the transparency and the blockiness are the top grades in the tourmaline. The color is the most important factor in the evaluation. In addition, the special optical effects of tourmaline can also enhance its value.
weight
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. In each of the different sizes and shapes, the most important thing is to find a tourmaline of the right size and style that will make you like it.
colour
In the gemstones, the color of the tourmaline is bright, pure, and evenly distributed. The color of the ribbon and the color ring are required to be pure and uniform, and the color bands and color circles are clearly defined. The quality of high-quality tourmalines is rose red and purple, their prices are very expensive, and the value of pink is low. Green tourmaline is best with grandmother green, followed by yellow-green. Because of the rareness of pure blue and deep blue tourmalines, their value is also high. All color tourmalines are bright and the value of the pure one is high.
Cleaness
The inner package is required to be as small as possible, and the crystal clear tourmaline is expensive, and the tourmaline containing many cracks and gas-liquid inclusions is usually used as a jade carving material.
Cut
The cutting should be regular, the ratio is symmetrical, and the polishing is good. Tourmaline can be cut into a variety of shapes: emerald, oval, standard round diamond and hybrid. Among them, the emerald type can reflect the beautiful color of the tourmaline, and the relative price is also high.
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