Lan Jue didn't greet the students. Instead, he 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 something out, and put it on the tray.
After that, he turned around and wrote a few big words on the blackboard, "Do you want a prize?"
Five simple words.
At first, only the students in front saw it, but soon, under the mutual reminder, all the students in the class also saw it.
The noise also became softer.
Lan Jue wrote a second line on the blackboard, "If you are too noisy, you can't draw a prize."
As soon as this line was written, the voices in the class suddenly quieted down.
There was a little more interest in Wang Hongyuan's eyes. Draw a prize?
It was really novel.
He didn't know what he would take out.
Although the class was temporarily quiet, they were all university students. Would ordinary prizes be in their eyes?
If the prize was not good enough, then the backlash would be even greater.
He had been teaching here for several years, and he knew these students who came to the elective class very well.
When he first came to the class, it was not easy for him to control the students' emotions.
"Hello, everyone."
Seeing that the class was quiet, Lan Jue walked out from behind the podium and bowed to all the students.
Jin Tao was the first to stand up, followed by Tang Xiao.
And the ones who stood up after them were impressively Tang Mi and Zhou Qianlin.
Shui Zhongdie also stood up in surprise.
The three beauties all stood up, and the male students who came because of the fame naturally also stood up. The students who had attended Lan Jue's etiquette class before and knew him well also stood up one after another.
"Hello, Miss Lan." Jin Tao almost shouted these words at the top of his voice.
Then, there was a cacophony of greetings in the class.
Lan Jue made a pressing gesture with both hands.
"Everyone, please sit down."
The students sat down again.
Jin Yan gently kicked Wang Hongyuan next to her.
"Mr. Wang, why don't you stand up?
Since we're here to listen to the lecture, we're students.
Moreover, we are colleagues. If we don't support Miss Lan, how can we set an example for the students? "
Wang Hongyuan smiled faintly and pinched his thumb and middle finger. "I didn't react in time."
Jin Yan pouted.
He didn't say another word.
Lan Jue walked back to the podium and pointed at the words on the blackboard. She smiled and said, "Lucky draw. This is real."
"Everyone must be guessing what the prize will be today.
Well, I'm sure you won't be disappointed.
Do you still remember what I told everyone at the end of the last class? "
"Gemstones!" Suddenly, a girl shouted from below.
Lan Jue gave him a thumbs up. "Yes, today I will be talking about gems.
Knowledge about gems.
It was very complicated, and there were many kinds of gems.
There were also many classifications.
It was impossible to finish the lecture in one lecture.
So, today we will only talk about one of them. If you're interested, I will continue to talk about others in the future. "
While saying that, Lan Jue stood up the tray in front of her.
The surface of the tray was dark blue velvet. It was the display tray of Zeus Jewelry Shop.
At this time, there was a shining gem on it.
The gem was crystal clear and white. On the dark blue velvet surface, it was like a dazzling star in the night sky.
"Who can tell me what this is?" Lan Jue smiled.
"Diamond." Shui Zhongdie, who was on the right of Zhou Qianlin, blurted out. Her voice was pleasant, melodious and melodious.
It lacked the softness of Zhou Qianlin, but it was more crisp.
"Yes." Lan Jue nodded. "This is one of the more common types of gemstones, diamond.
Today we will be talking about it.
This diamond is the final prize for today. "
"Wow." Suddenly, exclamations sounded one after another.
Using a diamond as a prize?
In all of the history of the NEU, this was probably the first time something like this had ever happened.
Wang Hongyuan, who was sitting in the back, immediately froze the mocking expression on his face.
With his eyesight, he could naturally tell that the diamond was about a carat in size. Although it could not be said to be particularly valuable, it was definitely not cheap.
Lan Jue pointed to the second line of words she had written on the blackboard.
This time, the classroom quieted down much faster than before.
All the students' attention was drawn to Lan Jue.
"There's a saying that goes, 'A diamond lasts forever, and a diamond lasts forever.'
I believe everyone has heard of it.
Although this was just an advertising slogan, in fact, it also described one of the characteristics of diamonds.
That is the hardness and resistance of diamonds. "
"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.
Excluding energy gems, diamonds were one of the hardest gems out of all the others.
If its hardness is 10, then the ruby and sapphire we are familiar with would be around 9. Jadeite would be 7.
In Upper Yuan China, Hetian jade was closer to 7.
Hardness above 7 is hard jade. Below 7 is nephrite.
Hence, Hetian jade can only be called nephrite. "
"Today is the first time we are talking about gems, and I don't want to instill too much knowledge into everyone. You just need to know that diamonds are the hardest.
Hence, we like to use them to make wedding rings. They are resistant to wear, can be preserved longer, and are not easily damaged.
They also symbolize the eternity of love. "
Lan Jue's voice was magnetic. Her speech was neither fast nor slow.
He spoke in a very simple manner, and every single student present could easily understand what he was saying.
Lan Jue walked down with the tray and handed it to Jin Tao. "Pass it to the back. Everyone, please take a look at this diamond."
A smile appeared on her face. "Everyone, please supervise each other. This diamond has to be given away. It doesn't matter to me if it's lost. It's going to be given to you anyway.
But the others won't have the chance to draw it. "
A small joke instantly lightened the atmosphere in the classroom.
Ignoring the diamond that was passed to the back, Lan Jue walked back to the back of the podium and said, "Now that I've talked about the hardness of diamonds, I want to introduce to everyone today the criteria for judging whether a diamond is good or bad.
First of all, it's size.
Generally speaking, almost all gems, including energy gems, are directly proportional to their value and size.
In other words, the bigger the gem, the more expensive it is, and the smaller it is, the cheaper it is.
This applies to diamonds as well. "
"Hence, for a diamond to be collectible, it has to be at least one carat.
There was a huge price difference between 0.99 carats and one carat.
The one I brought today is the standard one carat.
If it were two carats, the price would not be one plus one equals two, but would increase exponentially.
And so on. "
"In addition to size, there are several other criteria for judging whether a diamond is good or bad.
Simply put, is the value of the same one-carat diamond exactly the same?
The answer is no. If the quality is different, there will be a huge difference in price. "
The tray had already begun to be passed to the back. Almost all the students knew about diamonds, but it was the first time they were able to observe a diamond at such a close distance and listen to the characteristics of a diamond.
Most of the students were intrigued.
"In addition to size, there are three main criteria for judging whether a diamond is good or bad. The first is the color, then the clarity, and finally the cutting."
"First of all, in addition to colored diamonds, the whiter the better.
From lowest to highest, they are arranged in alphabetical order. The highest grade is D, which means 100% pure white, and can also be said to be perfect.
Then there is E, which means 99% perfect. Then there is F, which means 98% perfect.
These three color grades are known as the first step of the diamond's color.
Then there is g, h, i, j, k, and so on. The lower the letter, the more yellow the diamond is, and the cheaper it is.
For the same one-carat diamond, the D color is at least three times the price of the I color.
That's the difference in color.
Of course, in general, there is no need to pursue perfection. D, E, and F are three colors, and it is not easy to distinguish them without comparison. "
"The diamond I brought today is F color, which is already a very pure white diamond."
While the diamond was being passed, Lan Jue explained and wrote down the key points on the blackboard.
Then, he went on to explain the clarity of the diamond and the cutting process in simple terms …
"A perfect diamond needs to be the best in terms of color, clarity, and cutting.
This kind of diamond, we call it perfect, and also flawless!
This is the origin of the beautiful flawless diamond. "
Time passed unknowingly, and all kinds of knowledge about diamonds were imparted to the students present.
After a round of passing, the diamond finally returned to Lan Jue's podium.
"I know that everyone has been waiting for this moment to come.
Don't worry, Miss Lan will definitely keep her word.
Now, let's start the lucky draw. "
Lan Jue placed the tray in front of him. "Today's lucky draw will be simple, to ensure fairness.
Everything will be handled by the students present. "
As he spoke, he handed out the pieces of paper that he had prepared earlier. "Please write your name on the paper, and collect them together later. Then, we will put them in a box, and I will draw a piece from it. The diamond belongs to the person whose name is written on it."
Soon, the pieces of paper were collected again. Lan Jue placed the box on the podium, put the pieces of paper into it, and shook it vigorously. Then, he reached into the box and pulled out a piece.
"Okay, next, I announce that the student who won is Zhou Qianlin!" When Lan Jue read out the name, even he was stunned.
It couldn't be such a coincidence, right?
The one who won the diamond was actually Zhou Qianlin.
Zhou Qianlin, who was sitting below, was also slightly stunned. Many of the male students sitting behind her waved their arms, looking excited.
Lan Jue suddenly felt that something was wrong. A faint blue light flashed in his eyes, and he used his spiritual power to scan the box.
Among the more than a hundred pieces of paper, he saw 42 Zhou Qianlin's …
Recently, I also bought a diamond for my mother's 60th birthday present!
Hehe.
My dad also reads my book. If you see it, don't tell my mother.
Asking for monthly votes and recommendation votes.
(To be continued …)