Lan never greeted the students, but walked behind the podium and put down a tray in his hand. Then he took out a small cloth bag from his arms, took out something from it, and placed it on the tray.
After finishing this, he turned around again and wrote a few big characters on the blackboard, "Want a prize?"
Simple five words. At the beginning, only the students in front saw it, but soon, after reminding each other, all the students in the class saw it too. The noise also became smaller.
Lan Jue wrote a second line on the blackboard, "You guys are too busy to draw a lottery."
As soon as this line came out, the voices in the class fell silent.
Wang Hongyuan's eyes are a little more interested, lottery? What a novelty. I don't know what he will come up with. Although the class is temporarily quieted down, these are all college students, and ordinary prizes will be seen by them? Once the prizes are not good enough, then the subsequent rebound may be even greater.
He has taught here for several years and knows the students who come to take elective courses all too well. When he first came to class, it was hard for him to control the emotions of the students.
"Hi everyone." Lan Jue saw that the classroom was quiet, and then he came out from behind the podium and bowed to all the students.
Jin Tao was the first to stand up, followed by Tang Xiao. And it was Tang Mi and Zhou Qianlin who stood up immediately after the two of them.
The butterfly in the water also stood up in surprise. The three beauties all stood up, and naturally the male students who came here also stood up. The students who had attended Lan Jue's life quality class and knew him well also got up one after another.
"Hello, Teacher Lan." Jin Tao almost shouted these words at the top of his voice.
Then there were uneven greetings in the class.
Lan Jue made a downward motion with both hands, "Everyone, please sit down."
The students sat down again, and Jin Yan lightly kicked Wang Hongyuan next to her, "Mr. Wang, why don't you stand up? Since we are here to listen to the class, we are students. What's more, we are still colleagues. If we don't support Lan Teacher, how can you set an example for the students."
Wang Hongyuan smiled lightly, pinched his orchid fingers, "I didn't realize it."
Jin Yan curled her lips and said nothing more.
Lan Jue walked back to the podium, pointed to the words on the blackboard, and said with a smile, "Lucky draw, it's true."
"Everyone must be guessing what prizes are being drawn today. Then, I believe you will not be disappointed. Do you still remember what I told you at the end of the last class, what will this class teach you?"
"Gem!" Immediately, a girl shouted from below.
Lan Jue gave a thumbs up, "Yes, I will talk about gemstones today. The knowledge about gemstones is very complicated, there are many kinds of gemstones, and there are many classifications. It is impossible to finish a class. So, we will only talk about it today. One of them, if everyone is interested, I will continue to talk about the others in the future.”
While speaking, Lan Jue erected the tray in front of him.
The surface of the tray is dark blue velvet, which is the display tray of Zeus Jewelry Store. At this time, there was an extra shiny gemstone on it.
The gemstone is crystal clear white, and on the dark blue velvet surface, it looks like a dazzling star in the night sky.
"Who can tell me what this is?" Lan Jue smiled.
"Diamond." The butterfly in the water on Zhou Qianlin's right blurted out, her voice was beautiful, melodious and melodious. Zhou Qianlin's softness was missing, but it was a little more crisp.
"Yes." Lan Jue nodded to her, "This is one of the more common gemstones, the diamond. Today we are talking about it. This diamond is the last prize for today."
"Wow—" Suddenly, exclamations sounded one after another. A diamond as a prize? This has probably never happened in the entire teaching history of Huameng National College.
Wang Hongyuan, who was sitting in the back, suddenly froze the joking expression on his face. With his eyesight, he could tell that this diamond was probably as big as one carat. Although it couldn't be said to be particularly expensive, it definitely wasn't cheap either.
Lan Jue pointed to the second line of words written by himself on the blackboard.
This time the classroom was quiet much faster than before. Almost all the students' attention was attracted to Lan Jue.
"There is a saying called: Diamonds are forever, and one is forever. I believe everyone has heard of it. Although this is just a slogan, it actually tells a characteristic of diamonds. That is the uniqueness of diamonds. Strong and durable."
"I'm not a chemistry teacher, nor a physics teacher, so I won't tell you about the composition of diamonds. What I want to tell you is that diamonds are very hard. Without counting energy stones, diamonds are the hardest among other gemstones One. If its hardness is ten, then the rubies and sapphires we know are about nine, and the emeralds are seven. And the Hetian jade in Upper Proterozoic China is close to seven. Hardness above seven is jadeite, and below seven, It is nephrite jade. Therefore, Hetian jade can only be called nephrite jade."
"This is the first time I talk about gemstones today, and I don't want to instill too much knowledge into everyone. You just need to know that diamonds are the hardest. Therefore, we generally like to use them as wedding rings. They are wear-resistant and can be preserved for a longer period of time. It is not easy to break. It also symbolizes the eternity of love."
Lan Jue's voice is very magnetic, neither fast nor slow. The words are very simple, and every college present can easily understand them.
Lan Jue came down with the tray and handed it to Jin Tao, "Pass it to the back, please take a look at this diamond." There was a smile on his face, "Please also supervise each other, this diamond is It doesn’t matter to me if I lose it, it’s for you anyway. But other people won’t have the chance to draw it.”
A little joke immediately made the atmosphere in the class a little lighter.
Ignoring the diamonds that were passed to the back, Lan Jue walked back to the back of the podium and said: "The hardness of diamonds is finished, so what I want to introduce to you today is the standard for evaluating the quality of diamonds. First of all, it is the size." .In general, almost all gemstones, including power gemstones, are proportional in value to size. That is, larger gemstones are more expensive, and smaller gemstones are cheaper. This also applies to diamonds.”
"Therefore, if a diamond wants to be valuable as a collection, it must be at least one carat. Compared with one carat, there will be a big price gap between 0.99 carats. Today I bring this one, which is exactly the standard One carat. If it is two carats, the price is not one plus one equals two, but a geometric multiple increase. And so on."
"In addition to the size, there are several other criteria for evaluating the quality of a diamond. Simply put, is the same one-carat diamond worth exactly the same? The answer is no, the quality is different, and the price will be much different. "
The tray has now started to be passed on. Almost all students know about diamonds, but it is the first time for them to observe diamonds at such a close distance and listen to the characteristics of diamonds. Most of the students were aroused interest.
"In addition to size, there are three main criteria for evaluating the quality of diamonds. The first is color, then clarity, and finally cut."
"First of all, let's talk about color. Except for colored diamonds, the whiter the color of diamonds, the better. From low to high, they are arranged in alphabetical order. The highest grade is D. D means 100% pure white. It can also be said to be Perfect color. Then E, E is ninety-nine colors, almost close to perfection, followed by F, ninety-eight colors. These three color grades are known as the first step of diamond color. After that, G, H, I, J, K, and so on, the lower the letter, the more yellow the diamond itself is, and the cheaper it is. For the same one-carat diamond, the price of D color is at least three times that of I color. This is the difference in color Of course, generally speaking, there is no need to pursue perfection. The three colors of D, E, and F are not easy to see without comparison."
"The diamond I brought today is F color, and it is already a very white diamond."
Taking advantage of the passing of the diamonds, Lan Jue narrated and wrote down the key points of his speech on the blackboard.
Then he explained the clarity and cut of diamonds in simple terms...
"For a perfect diamond, it must achieve the best color, clarity and cut. This kind of diamond is called perfect by us, and it is also called flawless! Flawless diamonds come from this. "
Time passed unconsciously, and all kinds of knowledge about diamonds were also instilled in the students present.
After a round of passing, the diamond finally returned to Lan Jue's podium.
"I know that everyone is waiting for this moment. Don't worry, Mr. Lan will definitely mean what he says. Next, we will start the lottery draw."
Lan Jue put the tray in front of him, "Our lottery draw today is relatively simple, in order to ensure fairness. Everything is operated by the students present."
While talking, he sent out the slips of paper that he had prepared a long time ago, "Please write your names on the slips of paper, and collect them together later, and then we will put them in a box, and I will take out a piece of paper from it. Zhang, whose name is written on it, this diamond belongs to.”
Soon, the papers were collected again, and Lan Jue put the prepared box on the podium, put the papers in it, shook it vigorously, then reached into it, and took out one.
"Okay, let me announce that the winners are Zhou and Zhou Qianlin!" When Lan Jue pronounced the name, even he was stunned.
It can't be such a coincidence, can it? The one who won the diamond was actually Zhou Qianlin.
Zhou Qianlin who was sitting below was also slightly stunned, but many male students sitting behind her waved their arms and looked excited.
Lan Jue suddenly felt that something was wrong, a faint blue light flashed in his eyes, and his mental power quietly penetrated into the cardboard box and scanned around.
Among the more than one hundred notes, he saw forty-two Zhou Qianlin...