Turquoise's long history and beautiful appearance attract more and more fans. Many players who have just touched the gem also hope to receive one or two pieces of turquoise jewelry, but the color of the turquoise is very varied and makes many New players don't know how to start, so how do you choose high quality turquoise?
Seen from color
The color requirements of high-grade turquoise must be standard sky blue, followed by blue-green and green, and the color needs to be evenly distributed, pure color, and no mottling.
Look at the texture
Texture is a key factor in determining whether turquoise can be of high quality. Among them, the structure is dense, the texture is tough and delicate, and the hardness and density are higher.
Look at the variegated
Because of the formation environment of turquoise, it is determined that the interior often contains impurities such as clay minerals and calcite. Usually, these impurities are mostly white, and the more impurities, the lower the quality of turquoise. At the same time, the impurities contained in the interior have an important influence on the durability of turquoise. Therefore, in the process of purchasing turquoise, it is necessary to avoid white plaques as much as possible.
The quality of the turquoise is relatively small in the market, so this requires the buyer to be careful and with good patience to choose. In addition, there are many turquoises on the market that are processed by silicone. There is also a set of methods for this turquoise purchase.
During the formation of natural turquoise, most of the interior of turquoise is more or less cleft due to the influence of geological environment, and it is precisely because these cracks tend to crack during mining or processing. Therefore, people usually use silicone rubber for the purpose of increasing the firmness of turquoise. The industry also refers to tannin as tannin, which is processed by soaking the stone or semi-finished product to be processed into special glue. The turquoise tannin can be re-bonded to the location of the split in the structure to reinforce.
1 Turquoise tannin is a traditional process. Most of the previously used silicone materials are natural resin silicones, but now the processors mainly use transparent artificial resin.
2 Use a transparent resin to coat the turquoise, so it will not change the original color of the stone after treatment, but will deepen the color of the stone on this basis.
3 For the turquoise after the silicone, if you burn this turquoise, you can smell a rosin-like smell.
4 Although the turquoise after the rubber has played a certain role in reinforcement, its density and hardness have been further optimized. Some raw materials that could not reach the density can also be scratched on the glass. The raw material of tannin is still natural turquoise, but the grade is relatively poor.
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