Instead of greeting the students, Lan walked behind the podium and put down a tray in his hand. Then he took out a small cloth bag from his bosom, took something out of it, and put it on this tray.

After doing this, he turned around again and wrote a few large words on the blackboard, "Want a prize?" ”

Simple five words. At first, only the students in front of them saw it, but soon, after reminding each other, all the students in the class saw it. The noise became quieter.

Lan Jue wrote the second line on the blackboard again, "You guys are too lively to draw a lottery." ”

As soon as this line of words came out, the voices in the class suddenly fell silent.

Wang Hongyuan has a little more interest in his eyes, lottery? It's a novelty. I don't know what he's going to come up with. Although the class is quiet for the time being, these are all college students, and the general prizes will be seen by them? Once the prize is not good enough, then the next rebound may be even greater.

He's been teaching here for a few years now, and he knows these students all the better than the students who come to take elective classes. When he first came to class, he was able to control the students' emotions with great difficulty.

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

Jin Tao was the first to stand up, and then Tang Xiao. And the two of them stood up closely, and it was Tang Mi and Zhou Qianlin.

The butterfly in the water was also a little surprised and then stood up. The three beauties all stood up, and the male students who came to admire naturally also stood up, and the students who had taken the life taste class of Lan Jue and knew him well also got up one after another.

"Hello Mr. Lan." Jin Tao almost shouted these words at the top of his voice.

Then there was a ragged greeting from the class.

Lan Jue made a downward motion with both hands, "Everyone, please sit down." ”

The students sat back down. Jin Yan gently kicked Wang Hongyuan beside her, "Teacher Wang, why don't you stand up?" Since we are here to listen to the class, we are the 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 and pinched his orchid finger, "I didn't react." ”

Jin Yan pursed her lips and said no more.

Lan Jue walked back to the podium and pointed to the words on the blackboard. Smiled: "Lottery, it's true." ”

"Everyone must be guessing what kind of prize we drew today. Well, I'm sure you won't be disappointed. Remember what I told you at the end of my last class, what was this class about? ”

"Jewels!" Suddenly. A girl shouted out from below.

Lan Jue gave a thumbs up, "Yes, I'll tell you about gems today." The knowledge about gemstones is very complex, and there are many different types of gemstones. It is impossible to finish a lecture. So, we're going to talk about just one of them today, if you're interested. I'll go on to that later. ”

As he spoke, Lan Jue erected the tray in front of him.

The surface of the tray is a dark blue velvet finish. It is the Zeus jewelry store's own display plate. At this time, there is a sparkling gem on it.

The gemstone is crystal clear white, and on that deep blue velvet surface, it resembles a dazzling star in the night sky.

"Who can sue me, what is this?" Lan Jue smiled.

"Diamonds." The butterfly in the water on Zhou Qianlin's right blurted out, and her voice was very good. Pleasant and melodious. It is less gentle than Zhou Qianlin, but it is a little more crisp.

"Yes." Lan Jue nodded at her. "This is one of the more common gemstones. Diamond. That's what we're talking about today. This diamond is the final prize of the day. ”

"Wow-" Suddenly, exclamations rang out one after another. A diamond for a prize? This is probably not the case in the entire history of teaching at the National College of Huameng.

Wang Hongyuan, who was sitting in the back, suddenly froze with a playful expression on his face. With his eyesight, he could naturally see that this diamond was probably as big as a carat, and although it could not be said that it was particularly valuable, it was definitely not cheap.

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

This time the classroom was much quieter than before. The attention of all the students was almost all attracted to Lan Jue.

"There is a saying: A diamond is eternal, and a diamond is eternal. I'm sure you've all heard of it. Although this is just an advertising slogan, in fact, it also tells a story about one of the characteristics of diamonds. That is the strength and durability of diamonds. ”

"I'm not a chemistry teacher, I'm not a physics teacher, so I won't tell you about the composition of diamonds. What I want to tell you is that diamonds are hard. Without counting energy gemstones, diamonds are the hardest of the other gemstones. If its hardness is ten, then the ruby and sapphire we are familiar with are about nine, and the jadeite is seven. And Hetian jade in Upper Proterozoic China is close to seven. If the hardness is above seven, it is jadeite, and if it is below seven, it is nephrite. Therefore, Hetian jade can only be called nephrite. ”

"Today, I am talking about gemstones for the first time, and 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 it to make wedding rings, which are wear-resistant, can be stored for a longer time, and are not easy to be damaged. It also symbolizes the eternity of love. ”

Lan Jue's voice is very magnetic, and the speed of speech is not fast or slow. It's very simple, and every academy here can easily understand it.

Lan Jue walked down with the tray and handed it to Jin Tao, "Pass it back, please take a look at this diamond in every classmate." A smile appeared on his face, "Please also supervise each other, this diamond is going to be given away, it doesn't matter to me if I lose it, it's for you anyway." But no one else has a chance to draw it. ”

A small joke suddenly made the atmosphere in the class a little lighter.

Ignoring the diamonds that passed backwards, Lan Jue walked back to the back of the podium and said, "The hardness of diamonds is over, then, what I want to introduce to you today is the standard for evaluating the quality of diamonds." First of all, it's the size. In general, almost all gemstones, including power gemstones, are proportional in value and size. That is, the larger the gemstone, the more expensive, and the smaller the cheaper. This also applies to diamonds. ”

"Therefore, for a diamond to be collectible, it needs to be at least one carat or more. 0.99 carats, compared with one carat, there will be a big price gap. I'm bringing this one today, and it's the standard one-carat. If it is two carats, the price is not one plus one equals two, but a geometric multiple. And so on. ”

"In addition to size, there are several other criteria for judging whether a diamond is good or bad. To put it simply, is the same one-carat diamond worth exactly the same? The answer is no, the quality is different, the price will be much different. ”

The tray has now begun to be passed backwards, and almost all the students know about diamonds, but this is the first time that they have seen diamonds so closely and heard about their properties. The vast majority of students were intrigued.

"In addition to size, there are three main criteria for judging the quality of a diamond, the first is color, then clarity, and finally cut."

"First of all, when it comes to color, in addition to colored diamonds, the whiter the better. From low to high, they are arranged in alphabetical order, and the highest grade is D, which means 100% pure white, which can also be said to be perfect color. Then there's E, which is ninety-nine colors, almost close to perfect, and then F, which is ninety-eight colors. These three color grades are known as the first tier 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 D color is at least three times more expensive than the I color. That's the color gap. Of course, generally speaking, there is no need to pursue perfection, and the three colors of d, e, and f, are not easy to see without comparison. ”

"The diamond I brought with me today is F color, and it is already a very white diamond."

Taking advantage of the passing of the diamond, Lan Jue wrote down the key points he talked about on the blackboard while talking.

Next, he explained the clarity and cut of the diamond in simple terms......

"For a perfect diamond, you need to be the best in color, clarity and cut. This kind of diamond is what we call perfect, and we call it flawless! This is where the flawless diamond comes from. ”

Time passed unconsciously, and all kinds of knowledge about diamonds were instilled in the students present.

After a lap of passing, the diamond finally returned to the podium of the Blue Absolute Circle.

"I know that everyone is waiting for this moment to come. You can rest assured, what Teacher Lan says definitely counts. Let's start the draw. ”

Lan Jue placed the tray in front of him, "Our lottery today is relatively simple, in order to ensure fairness. All qiē were operated by the students present. ”

As he spoke, he sent down the piece of paper that had been prepared a long time ago, "Please write your names on the piece of paper, and then we will put it in a box, and I will take out one from it, and whoever the name is written will belong to whoever this diamond belongs to." ”

Soon, the piece of paper was put back away, and Lan Jue put the prepared box on the podium, put the piece of paper into it, shook it vigorously, and then reached into it and pulled out one.

"Okay, let me announce that the winning classmates are, Zhou and Zhou Qianlin!" When Lan Jue pronounced the name, even he himself was stunned.

It can't be such a coincidence, right? The one who won the diamond turned out to be Zhou Qianlin.

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

Lan Jue suddenly felt that something was wrong, a faint blue glow flashed in his eyes, and his spiritual power quietly probed into the cardboard box and swept around.

In all the more than 100 notes, he saw forty-two Zhou Qianlin......

Recently I also bought a diamond for my mother's 60th birthday! Hey. My dad also reads my books, and if you do, don't sue sù mom.

Ask for a commuter pass or a recommended ticket. (To be continued)