Chapter 72: Suddenly enlightened

Tang Han has briefly seen these jewelry, jade and gems for inspection, but diamond rings account for a large part.

According to Liu Weidong's introduction, the merchants and consumers who were sent for identification were basically separated from each other. The difference is that the merchants sent almost all the authentic products, while the consumers sent mostly fakes. Everyone knows the truth. Without paying too much attention, Tang Han came here to learn to use these instruments first. As for whether to do this job in the future, that's a story later.

First, I took two jadeites that I was most familiar with as experimental products. One was a bracelet that looked like a green from a distance. Tang Han looked closer and found that the color inside was not natural and suspected of being fake. When he looked carefully, he found that it was full of holes and the color distribution was uneven. Tang Han quickly marked it in his heart. The dyed C-type product can be bought for dozens of yuan. If it was used as a testing center, it would have to buy at least thousands of yuan. Another person was deceived.

The other one is Maitreya Buddha, mixed with dark green and glutinous rice fields with floating flowers. Although the color looks not very good at first glance, the color is normal at least and it has a texture in his hand. Tang Han carefully looked at it with his eyes that were about the same as a magnifying glass for a while and immediately determined that this was indeed a natural A-grade product. As for the price, it should not be too high, and it costs 5,000 yuan to be the best.

Tang Han saved the photo sessions, first weighed the specific gravity. The jade bracelet showed a specific gravity of 3.30, while the Maitreya Buddha's one was 3.32, both within the normal range of jade specific gravity, 3.34 (+0.06~-0.09). If you imitate other jades, you will be exposed at this level.

The curious Tang Han put Maitreya Buddha under a gem microscope. The gem microscope is extremely simple to operate, but has a large function. It can detect that the 10x magnifying glass cannot clearly confirm or observe the external and internal characteristics of the gem. It can observe the inclusions, cleavage, double crystal patterns, growth lines, and ribbons inside the gem; observe the grinding, polishing and accidental damage of the gem; identify the two-layer stone and three-layer stone of the gem.

However, observation under a microscope is not much different from that of Tang Han’s naked eye. Both of them need to be identified to make subjective judgments.

Next is the GIC spectrometer, which has good light transmission performance and high resolution. It is also an effective instrument for identifying the authenticity of the gemstone. For example, dyed jade has different spectral characteristics from natural green jade.

Tang Han knew that mastering the use of spectrometers is a necessary skill for gemologists. Under the spectrometer, the color of the gems suddenly disappeared, and the true and false are clear. For example, the true and false jade that Tang Han took, the dyed jade is obviously different from the natural green jade.

Other detection instruments include Charles color filters, etc. Almost all instruments are very easy to operate, but the results are analyzed by a lot of theoretical knowledge. Tang Han only took jade to test, but there was no ugly test. The refractive index and spectroscopy were detected one by one, which was not biased from his detection results based on his naked eyes and feel.

While Tang Han was fiddling with these instruments, his colleagues who had eaten came back one after another. When Tang Han was operating the expensive infrared spectrometer, a young man of 27 or 28 came to him. Tang Han still remembered Liu Weidong's introduction at that time. Wang Hexin, a master's student at China University of Geosciences, had an annual salary of more than 100,000 yuan in more than a year. He lived a leisurely life.

"Is Xiao Tang still studying?" Wang Hexin, who was still resting, started chatting with Tang Han, who was not much different from his age.

"Yes, I come here to study and study when I have no classes. I really envy you, like Brother Wang, who do this profession, have a stable job, and there are many treasures to watch, and their salary is good."

Tang Han didn't stop his hand when he spoke. Sure enough, the infrared spectrometer had super powerful functions and he could detect the bracelet that had been bleached and filled immediately, but Maitreya Buddha had no problem.

"Actually, there is no big intention to do this industry. Sometimes it feels boring and exhausting physically and energy." Wang Hexin said with a smile. He has been here for some time, and there are quite a few jewelry he has handled. He opened his eyes, but there are not many jewelry that really belongs to him. Ordinary people look down on them, and the best jewelry is not something he can afford.

"It's much better than many industries! Just in terms of rewards and benefits, it's much better than them." After testing these two pieces of jade, Tang Han also took all the instruments, designed with humanized design and easy operation. As long as he mastered the basic knowledge, he could quickly draw a simple, clear but very accurate judgment result. This is the conclusion that Tang Han came to about these detection instruments.

Wang Hexin smiled, "That's true, it's just that people are always unsatisfied! By the way, Xiao Tang, did you learn jade before?"

"I haven't studied for a long time and my vision is not very accurate. It's much more convenient to identify these detection instruments." Tang Han said modestly. In fact, his identification of jade has reached the point of perfection, but it's hard to say that he is an expert in this field now!

"But the practical use of these detection instruments is not very good." Wang Hexin sighed, as if there was a lot of things to say.

Tang Han was confused by him, "No, I think they are all very useful and can draw more accurate conclusions."

"I'm not talking about this. When trading jewelry, it's impossible to bring these instruments with you! At most, a ten-fold magnifying glass is brought, so most of the jewelry consumers buy and then appraise are fakes. It's not a good idea to use these advanced instruments to detect fakes." Wang Hexin continued to explain, and it can be seen that he is also a person with a temperament, or he is angry with a book.

"If everyone goes to a regular store to buy it and ask for an appraisal certificate, invoice, etc., these things can be avoided. The instruments of the testing center can also play a more efficient role."

"You don't know that the products used by merchants for testing are basically genuine products, but they can also fake the appraisal certificate and deceive consumers. It is not common for a single certificate to share multiple jewelry." Wang Hexin took a breath. He has seen too much of these things in the past few years of learning and appraisal.

"And, I don't know if you know that there is an unwritten rule when trading jewelry. The buyer and seller basically do not bring these instruments, otherwise they will be embarrassed. People will think that you are a rookie and ask for a price when you open your mouth. It is difficult to do business normally." Wang Hexin is very knowledgeable about these.

"I've heard of it before."

Tang Han felt aroused, and this was true. He always thought that his special abilities had little practical application value except perspective, because these can be easily realized with detection instruments, but the reality is not the case. The detection instruments are only available in the detection center.

In jewelry trading, rich experience and unique vision still play an extremely important role. Tang Han also made up his mind to go back and try to simulate the functions of these instruments, and strive to determine the authenticity of the jewelry without the instruments.

"Hey, look at it! This is another emerald jewelry sent by someone to appraise!" Wang Hexin picked up the so-called emerald-inlaid ring placed next to it and handed it to Tang Han.

"What's going on?" Tang Han took it, and the touch was obviously wrong. Although the color of the so-called emerald on it was pure, it was very uniform in distribution, and it was pure inside, with basically no impurities. Tang Han labeled it as a fake in his heart.

"CCTV has reported that many tourists bought these discounted emerald jewelry under the pressure of some tour guides in Southeast Asia, Singapore, Malaysia and Thailand when they were traveling to Southeast Asia, Singapore, Malaysia and Thailand." Wang Hexin looked very indignant.

"Can you force them?" Tang Han answered while looking at the so-called emerald in his hand. He recalled that there are many ways to identify emeralds, using Chelsea color filters, heavy liquid method, using a bowl of water to observe, using a brazier, etc. It is not easy to identify with the eyes alone, but Tang Han quickly remembered another identification method. Emeralds have a high hardness and can mark scars on standard crystal hardness sheets, while imitation glass cannot.

But for a moment, Tang Han couldn't find the crystal and it was difficult to find the Chelsea color filter, and he wouldn't bring these things when trading.

After thinking hard, Tang Han thought of another method. After wiping the emerald, he tried to lick it with his tongue. There was no coolness that emerald should have, but instead felt a warm feeling. Only green glass can have such heat conductivity. The book introduces that depending on the heat conductivity of glass and emerald, licking green glass on the tongue will have a warm feeling, while licking emerald on the tongue will have a cool feeling for a long time.

"We have encountered many such situations. When entering a tour group, it is equivalent to falling into a tiger's den. The tour guide has many methods. The usual tricks are like asking them to get off the car and take them to a local jewelry store to buy jewelry. If you insist on not buying it, you will get angry with you and use language to stimulate you. Why do you dare to travel abroad if you don't have money? Under the temptation of discounts, many people pay for the so-called face to buy these fake goods back."

Wang Hexin was still talking nonstop, and saw Tang Han's actions in a blink of an eye, "Did Xiao Tang identify it? Is this a copy of emerald?"

"It should be green glass, which is the cheapest to build and the color difference will not be too much."

"It seems that your vision is not bad at all!" Wang Hexin laughed.

Tang Han smiled and said, "Many people know these methods, but few people use them."

"I don't need to ask me!" Wang Hexin smiled even brighter.
Chapter completed!