Instead of greeting the students, Lan Jue walked to the back of 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 doing this, he turned around and wrote a few big words on the blackboard, "Do you want a prize?"

Five simple words. At the beginning, only the students in front saw it, but soon, with mutual reminders, all the students in the class saw it. The noise also became smaller.

Lan Jue wrote the second line on the blackboard again, "You can't draw if you are too lively."

As soon as the line of words came out, the voice in the class suddenly became quiet.

Wang Hongyuan had a little more interest in his eyes. The lottery was really novel. I don’t know what he would do. Although he temporarily calmed down the class, these were all college students. They would see the general prizes? Once the prizes were not good enough, the subsequent rebound might be even greater.

He has been teaching here for several years and can't understand these students who come to take elective courses. When he first came to class, he finally managed to control the students' emotions.

"Hello everyone." Lan Jue saw that the classroom became quiet, and then walked out from behind the podium and bowed to all the students.

Jin Tao stood up the first time, then Tang Xiao. And the ones who followed them stood up were Tang Mi and Zhou Qianlin.

The Butterfly in the Water was also surprised and then stood up. All the three beauties stood up, and the male students who came here naturally also stood up. The students who had taken Lan Jue's life taste class and had some understanding of him also stood up one after another.

"Hello Teacher Lan." Jin Tao almost shouted these words at the top of his throat.

Then there were uneven greetings in the class.

Lan Jue made a pressing action with both hands. "Please sit down, everyone."

The students sat down again. Jin Yan gently kicked Wang Hongyuan beside him. "Teacher 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 Teacher Lan, how can we set an example for the students?"

Wang Hongyuan smiled indifferently, pinched the orchid finger, "I didn't react."

Jin Yan curled her lips and stopped saying a word.

After Lan Jue walked back to the podium, he pointed to the words on the blackboard and smiled and said, "The lottery is true."

"Everyone must be guessing what prizes I'm going to draw today. So, I believe you won't be disappointed. Remember when I ended my last class, do you tell you what this class will tell you?"

"Gem!" Suddenly, a girl shouted from below.

Lan Jue gave a thumbs up, "Yes, today I will tell you about gems. The knowledge about gems is very complicated, there are many kinds of gems. There are also many categories. It is impossible to finish a class in one class. So, let's only talk about one of them today. If you are interested, I will continue to talk about the others in the future."

While speaking, Lan Jue raised the tray in front of him.

The surface of the tray is dark blue velvet face, which is the display plate of Zeus Jewelry Store. At this time, there is a shiny gem on it.

The gem is crystal clear and white, and on the surface of the dark blue velvet, it looks like a dazzling star in the night sky.

"Can anyone tell me what this is?" Lan Jue said with a smile.

"Diamond." The butterfly in the water on the right side of Zhou Qianlin blurted out. Her voice was very nice, pleasant and melodious. It was less gentle than Zhou Qianlin, but more crisp.

"Yes." Lan Jue nodded to her, "This is the most common one among gems, diamonds. Today we are talking about it. This diamond is the last prize today."

"Wow" Suddenly, screams rang out one after another. Using a diamond as a prize? This may not have happened in the teaching history of Huameng National College.

Wang Hongyuan, who was sitting behind, suddenly had a joking expression on his face. With his eyesight, it was naturally obvious that this diamond might be as big as one carat. Although it cannot be said that it is of great value, it is definitely not cheap.

Lan Jue pointed to the second line of words he had written on the blackboard with his finger.

This time the classroom was quieter much faster than before. Almost all the students' attention was attracted to Lan Jue.

"There is a saying that diamonds are forever and one is everlasting. I believe everyone has heard of them. Although this is just an advertising slogan, in fact, it also tells one of the characteristics of diamonds. That is the strength and wear resistance of diamonds."

"I am not a chemistry teacher or a physics teacher, so I won't tell you the ingredients of diamonds. What I want to tell you is that diamonds are very hard. Without calculating energy gems, diamonds are the hardest among other gems. If its hardness is ten, then the ruby, sapphire, we are familiar with, is about nine, and jade is seven. The Hetian jade in the Proterozoic Chinese is close to seven. The hardness of seven or more is jade, and less than seven is soft jade. Therefore, Hetian jade can only be called soft jade."

"Today I talk about gems for the first time, I don't want to instill too much knowledge in 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, can be preserved for a longer time, and are not easily damaged. They also symbolize the eternity of love."

Lan Jue's voice is very magnetic, his speech is not fast or slow. He speaks very lightly, and every college here can easily understand it.

Lan Jue walked down with a tray and delivered it to Jin Tao. "Transfer to the back, please see this diamond." A smile appeared on his face, "Please supervise each other. This diamond is to be given, and it doesn't matter to me if it is lost. It's all for you to give it to you anyway. But the others don't have the chance to draw."

A little joke made the atmosphere in the class feel a little relaxed.

Regardless of the diamonds passing backwards, Lan Jue walked back to the back of the podium and said, "The hardness of the diamond is finished. So, what I want to introduce to you today is the standard for evaluating the quality of the diamond. First of all, it is the size. Generally speaking, almost all gems, including energy gems, are proportional to their value and size. In other words, the larger the gems, the more expensive it is, the smaller the cheaper it is. This also applies to diamonds."

"So, if a diamond wants to have collection value, it takes at least one carat. 0.99 carats, compared with one carat, there will be a big price gap. Today I bring this one, which is the standard one carat. If it is two carats, the price is not one plus one equals two, but an increase in geometric multiples. And so on."

"In addition to size, there are several other standards for evaluating the quality of diamonds. Simply put, is the value of a diamond of one carat exactly the same? The answer is no, the quality is different, and the price will be much different."

The tray has now begun to be passed on. Almost all students know about diamonds, but it is the first time that they have observed diamonds at such a close distance and have heard people talk about the characteristics of diamonds. Most students have been interested.

"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, in addition to colored diamonds, the whiter the color of diamonds is naturally the better. From low to high, they are arranged according to letters. The highest level is d and d means 100% pure white, or it can be said to be a perfect color. Then e and e are nine nine colors, almost close to perfection, and then f and ninety eight colors. These three color levels are known as the first step of diamond color. After that, g, h, i, j, k and so on. The later the letters, the yellower the diamond itself is, the cheaper it is. For the same carat diamond, the d color is at least more than three times the price of i color. This is the color gap. 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, which is already a very white diamond."

Taking advantage of the diamond transmission, Lan Jue told the story while writing down the key points he had said on the blackboard.

Next he told the clarity of the diamond and cut it in an easy-to-understand manner...

"A perfect diamond must be achieved, and the clarity and cutting are all the best. This kind of diamond is called perfect, also called flawless! Flawless diamonds come from this."

Time passed without realizing it, and various knowledge about diamonds were instilled into the students present.

After a circle of transmission, the diamond finally returned to Lan Jue's podium.

"I know, everyone is waiting for this moment to come. Don't worry, Teacher Lan will definitely keep his word. Let's start the lottery now."

Lan Jue put the pallet in front of him, "Our lottery today is relatively simple to ensure fairness. Everything is operated by the students present."

As he said, he sent down the piece of paper he had prepared long ago, "Please write your names on the piece of paper, and collect them together later. Then we will put them in a box, and I will take one out of it. Whoever the name is written, the diamond belongs to."

Soon, the paper was put back on the podium, and Lan Jue put the prepared box into it, shook it hard first, then reached out and pulled out one.

"Okay, I'll announce now that the winning classmate is Zhou, Zhou Qianlin!" When Lan Jue read out this name, even he was stunned.

It’s not such a coincidence, is it Zhou Qianlin who won the diamond.

Zhou Qianlin, who was sitting below, was also slightly stunned, while many male students sitting behind her waved their arms, looking excited.

Lan Jue suddenly felt something was wrong, a faint blue light flashed in his eyes, and his mental power quietly penetrated into the cardboard box and swept around.

Among all the more than one hundred notes, he saw forty-two Zhou Qianlins...

Recently, I also bought a diamond for my mother's 60th birthday gift! Hehe. My dad also reads my book. If you see it, don't tell her.

Please give me a monthly ticket, recommend ticket. (To be continued...)
Chapter completed!