How to distinguish Hetian Baiyu? The study found that the white jade of Russia is slightly different from the white jade of Xinjiang, China. In terms of structure, the size of Russian white jade is larger, most of the grains are between 0.01 and 1 mm, and the whole is fibrous and granular. The structure of Xinjiang white jade is extremely dense, mainly fiber. Interwoven structure, but this is difficult to observe under a gem microscope, only a few interwoven filamentous structures can be seen. In terms of gloss and transparency, Russian white jade has high transparency, strong luster, and generally glass luster. Hetian Baiyu has a relatively low transparency, and gloss is a soft grease luster.
In short, from the various properties of Hetian Baiyu, it has more sleek requirements in Chinese jade culture. But in the gem laboratory, these differences don't make much sense, and we can hardly find strong evidence of origin identification, including large instruments like DEXRF, which don't make much sense, but people who like nephrite, or traditional The concept of jade culture is to prefer Hetian jade.
Originally, people thought that the white jade of the Russian material, the white jade of Qinghai was lower than that of Hetian jade and did not accept them. Now it has been filled and processed. If it is not told at the time of purchase, the purchaser must have been deceived.
Then, at present, the processing methods and processes of Baiyu are still high-level trade secrets, and even the behavior of filling and processing Baiyu is little known. Therefore, almost all buyers do not know that Baiyu will be treated, they can’t think of it. The "Hetian jade" may be native to Russia.
From a sensory point of view, especially in terms of color and transparency, Hetian Baiyu is more like animal fat, especially fat in the sheep's large intestine. Natural Russian white jade has ice sensation, while filled white jade feels more like snow. Especially like snow that is hard pressed by hand.
The refractive index (point measurement method) is basically 1.60~1.62, or basically 1.60~1.61.
There is almost no appraisal significance under the polarizer, but according to statistics, the shaving of the Russian material is weaker.
Under ultraviolet light, Hetian Baiyu and Russian white jade are basically inert, while some filled white jade have moderate white fluorescence under long waves.
According to statistics, Hetian Baiyu has the highest density of 2.95 (±0.05) g/cm-3, the density of Russian white jade is 2.89 (±0.05) g/cm-3, and the density of filled white jade is 2.75 (±0.15) g. /cm-3.
Microscope observation, when the top light source is irradiated, the surface of Hetian Baiyu is very round, and the light transmitted to the interior is relatively uniform, that is, the structure of Hetian Baiyu is dense and uniform; while the surface of the white jade is often visible in the surface of the Russian jade, which can distinguish the crystal. Boundary, occasionally you can see the directional reflection of a crystal facing the light. The surface of the filled white jade is rough and uneven, similar to the frosted glass seen under the microscope, and the flat surface of the intaglio part can see the jagged phenomenon similar to the jade fracture, and occasionally the more obvious pits and concaves can be seen. The luster in the pit is relatively weak. Unlike the jade filling, the filling jade can hardly see the shear groove pattern, which means that even the relatively coarse structure filled with nephrite is much denser than jade. In addition, some filled nephrite with a light brownish yellow color can be found under the microscope. The deeper the jade is, the deeper the color.
When the surface of the jade is irradiated with a strong bottom lamp or irradiated with a fiber optic lamp, a cotton-like inclusion body is often seen, and a black inclusion body is occasionally seen. The Russian material and the filled white jade have almost no cotton-like inclusions, but some of the intertwined structures resembling the scorpion wings and similar to the light yarns. Filled with white jade, almost no black inclusions can be found.
The most effective and accurate way to identify is to use an infrared spectrometer.
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