Song Tao knew very well that doing this would offend people, but this was completely his instinctive reaction. He would never allow himself to watch others being deceived and sit idly.

The stall owner's face darkened when he heard Song Tao's words, but his words were not at all confusing, and immediately began to refute.

"Why are you kids swearing? You can tell me that my Shaphry is fake. Do you think you are a human flesh appraiser?"

The fat businessman looked like a student and smiled disapprovingly: "Brother, I have looked at this 'shasha' for a long time with a magnifying glass. There is no problem. Don't slander others randomly."

The so-called Shasha is actually the abbreviation of Shashafury. People in the jewelry business circle are used to using this intimate name.

At this time, the few people who were enjoying the gems at the booth next to him also noticed the situation here, so they came over with the mentality of watching the fun.

Song Tao knew very well that such criminals had never been dying, so he stared at the stall owner with a burning look and said slowly: "If I guess correctly, this is actually artificial yttrium aluminum garnet."

"Artificial yttrium aluminum garnet? What is that?"

When the fat businessman and several other onlookers heard such a difficult name, they were confused. Obviously, they did not have this number in their impression.

"I've never heard of it. I don't know if this student is wrong."

In fact, they had never heard of it and were also expected by Song Tao.

In the 1960s, artificial yttrium aluminum garnet was used as a counterfeit diamond, but not long after, the physical properties of zirconia with a diamond appeared, and soon replaced its position.

In the past decade, the "synthetic Moissanite" with refractive index and fire color even surpassed that of natural diamonds has emerged. Artificial yttrium aluminum garnet has completely disappeared in the imitation diamond market, and most jewelry practitioners can no longer remember it.

Song Tao once thought that this material had faded out of history, but his teacher accidentally mentioned that last month a buyer sent the "Shafule Stone" that he had spent 120,000 yuan to Huachangdi for inspection.

There is nothing unusual about this gem from its appearance, but after testing with a Fourier transform infrared spectrometer, the spectral diagram actually shows that it is an artificial yttrium aluminum garnet.

The 120,000 yuan was wasted instantly.

However, this cannot be blamed on the buyer being stupid, but these counterfeit products are too clever.

The hardness of schafrey stone is about 7-8, the refractive index is 1.85, the dispersion is 0.027, and the density is 3.6.

The hardness of artificial yttrium aluminum garnet is 8, refractive index 1.83, dispersion 0.028, and density 4.5.

Except for the slightly different density of the two, the other physical properties are basically the same. Even if you are a veteran who is familiar with gem identification, there is no possibility of distinguishing it with the naked eye.

Song Tao's teacher predicted at the time that artificial yttrium aluminum garnet will inevitably be very rampant in the future shafrey stone market. This is also the reason why Song Tao dared to judge that this was artificial yttrium aluminum garnet without any professional identification methods.

Sometimes identification does not only rely on various instruments and knowledge, but also requires reasonable speculation and bold decisions.

As expected, after the righteous stall owner heard these words, his expression was obviously unnatural for a moment. Song Tao was right, his shuffle stones were indeed artificial yttrium aluminum garnet.

As the price of shafrey stone has soared in recent years, some counterfeiters have accidentally discovered that artificial yttrium aluminum garnet, a material that has been abandoned by the synthetic gem industry for many years, is extremely close to the physical properties of shafrey stone.

So they incorporated a little chromium element during their production process, turning the originally colorless artificial yttrium aluminum garnet into green, and after cutting and grinding, they mixed into the shafrey stone market to earn black heart money.

But this stall owner is an old fox who has been around for many years, and even if it is exposed, he is still in danger.

"Everything is important to have evidence. If you have the ability, you can come up with evidence. Otherwise, why should you just talk nonsense here?"

The reason why the stall owner is so righteous is that the appearance of shafrey stone and artificial yttrium aluminum garnet is very similar, and it is impossible to make a conclusion without using large and professional equipment in the laboratory. He was sure that Song Tao could not produce strong evidence before he dared to say this.

Song Tao naturally understood the stall owner's thoughts and secretly complained in his heart: He is really an old fox, but it's a pity that you underestimated me too much.

He looked at the people watching, smiled and said, "It's not difficult to get evidence. Does anyone bring a 365 ultraviolet lamp? Please borrow it."

When she heard that Song Tao wanted to use the 365 ultraviolet lamp, the stall owner breathed a sigh of relief. The 365 ultraviolet lamp is a portable identification device that can be used to detect the fluorescence reaction of jewelry and jade.

In his cognition, both thaffreite and artificial yttrium aluminum garnet produce fluorescence reactions under ultraviolet rays, so they cannot be distinguished.

The 365 ultraviolet lamp is a must-have item for jewelry buyers. Soon someone took out his ultraviolet lamp and handed it to Song Tao.

Song Tao thanked politely, then turned on the switch and shone directly on the "Shafury Stone". Under the purple light, the originally green gem emitted a bright red light throughout, which was the fluorescence effect.

The fat businessman was stunned for a moment and smiled indecently: "Brother, shafrey stone is also called chromium vanadium calcium aluminum garnet. Gems containing chromium elements will have fluorescence reactions, so there is no problem."

Seeing that Song Tao had tossed for a while and couldn't find anything, the people watching around also began to persuade him.

"Young man, you college students like to read books until you are dead. You may remember to keep your textbooks in your back. We are all people who have been traveling around the world for many years, and we must have more experience than you."

This is not very friendly.

Song Tao was born in the country's number one gemology major, so he is naturally an "academic school". The group of people in front of him represent a "wild way". This person is undoubtedly belittling their academic school ability.

Although the academic school and wild paths are often harmonious, after all, heroes don’t have to ask where they come from. A black cat and white cat are good cats that can catch mice, but both sides think that they are the most powerful ones in their hearts.

When the stall owner saw that Song Tao did not convince everyone, he was collectively questioned by everyone. He glanced at him with a little pride, as if saying: Play with me? You are too young.

When Song Tao saw this face, he couldn't help but snorted coldly, not angry at everyone's doubts, and continued to state confidently.

"You seem to have forgotten one thing. Shaphrey stone is essentially a garnet family, so it will inevitably have a certain amount of iron. Gems containing iron will have a strong quenching of ultraviolet light."

"Don't you think the fluorescence effect of this shaffry stone is a bit too strong?"

After these words were said, the onlookers were quiet for a moment, and the fat businessman's expression also changed for the first time and he fell into deep thought.

Indeed, thaffry stone contains chromium that can produce fluorescence reactions, but at the same time there are also a small amount of iron that can inhibit fluorescence reactions.

As one goes up and down, the fluorescence reaction of thaffry stone is usually of medium level, and the fluorescence intensity produced by the ultraviolet light in front of me is extremely high, which is brighter than all the thaffry stones he has bought in the past.

Seeing the fat businessman thinking, Song Tao paused and continued to replenish.

"Artificial yttrium aluminum garnet and thaffreyite both contain chromium, so they all have fluorescence effects. However, since artificial yttrium aluminum garnet does not contain iron, the fluorescence effect will be stronger, which is also the simplest principle and method to distinguish them."

Ordinary people may think that this little difference in fluorescence reaction is taken seriously, but don’t forget that the jewelry industry is well-known as “deep” and various means of profiteering are hard to guard against.

What's more, after more than a century of development, the synthetic gem technology is now amazing and must be treated with extremely small strange things carefully.

The fat businessman has been in the jewelry industry for nearly ten years, and after Song Tao mentioned this, he finally became alert.

Seeing that the fat businessman was not talking for a long time, he seemed to start to shake. The stall owner became a little anxious and quickly defended himself.

"Brother, don't listen to this child's nonsense. What kind of experience can he have as a student? Then any fluorescence reaction is possible. How can you tell if you use an ultraviolet lamp to light it up and then determine whether it is true or not?"

The fat businessman frowned and finally quit the transfer page of his mobile phone: "I'd better not want this stone first, sorry."

After saying that, he patted Song Tao on the shoulder and whispered: "Thank you, brother."

When the stall owner saw the fat meat on his lips flew like this, he pointed at Song Tao with a blushing face and said, "You guy, believe it or not, I'll ask the security guard to blow you out!"

Song Tao was not willing to be outdone: "Am I talking nonsense, you know that this kind of jewelry exhibition will be equipped with mobile temporary appraisal stations. If you think I am wronged you, go with me now."

"The density of artificial yttrium aluminum garnet is one quarter higher than that of natural schafrey stone. Even infrared spectrum is not needed. You can tell the true or false after measuring the specific gravity."

The stall owner was so sarcastic: "If you said I would go, I would go? You treat yourself too much."

As soon as these words were said, the onlookers shook their heads and understood a little in their hearts. It didn't take much time to measure the proportion. The stall owner has been making an empty statement here for so long, and there is probably a ghost.

Seeing the eyes of the people around him gradually becoming sharp, the stall owner finally became angry and turned his head to shout at the two security guards standing in the distance: "Security guard! Someone here disturbed me from doing business and bombed him away!"

The two nearby security guards had long noticed the dispute here. When they heard the stall owner's call, they immediately walked over quickly and warned Song Tao with great momentum: "Please stop disrupting the exhibition order, otherwise we can only invite you out."

They do not care whether it is true or not, but only know that their responsibility is to maintain the order of the exhibition.

Song Tao felt disappointed, so he simply ignored the two security guards and directly obtained an appraisal certificate: "I didn't tell you the most serious mistake, I just didn't want to make things bigger."

"I didn't expect you to be slim..."

As he said that, Song Tao stretched out a finger on each of his hands, measuring about half a meter in width.

"So thick!"

The stall owner was stunned by Song Tao's actions for a moment. As the saying goes, cutting off people's wealth is like killing parents. Although he made money by himself, he was cheated of someone who was unlucky, and what does it have to do with others?
Chapter completed!