Yan Juan smiled crampedly: "I still don't understand the true meaning of these four principles!" I just listened to Mr. Pang explain a little during class, and the rest was all my own thinking. ”

"It doesn't matter, you can't make a big fat man in one bite, and no one will think that Rome can be made in a day." Yan Yixin showed an encouraging smile, "You see where to start the knife, which can improve the utilization rate of the rough stone and maximize the retention of the weight of the finished diamond?" Don't worry, I just want you to come up with a plan, and if it's not appropriate, I'll tell me what else needs to be considered. ”

Yan Wan pursed her lips, looked at the diamond with only one window open again, and drew a straight line on the drawing: "I think it's better here." ”

Liu Li glanced at her in surprise, but Yan Yixin didn't say anything: "Why do you think it's better to split like this?" ”

"Because there's a distinct mass of inclusions, of course, it's going to be split directionally, and the diamonds are split through the lines of this inclusions. This results in two finished diamonds of similar size and clarity, rather than the smaller one being clean, with most of the inclusions left in the larger one. Doing so should not be in line with the principle of maximizing benefits. ”

Liu Li suddenly struck each other with both palms: "Yan Xuan, now I understand why Yixin will take you to observe." Although you have only learned a fur, no, you have only learned the fur of the fur, but you have an extraordinary intuition about the gemstone itself. I've been rolling around in diamonds since I was a child, and I don't know how much more I can see than you, and at your age, I really don't have such an accurate vision. ”

Yan Yixin smiled and took the diamond and drew a thin strip of black on its outer layer. And the part, compared with Yan Juan's painting on paper, is exactly the same.

"Generally speaking, the work of drawing lines is done by experienced designers. Yan Xuan, although you have just entered the house, this eyesight is not trivial. Yan Yixin put down the diamond, "Your lines are very accurate." There's another thing that you may not be aware of yourself, but are just intuitively drawn here. Caring and seeking cleanliness have always been the most contradictory principles in diamond cutting, and they need to be balanced in practice. ”

Liu Li was robbed of the right to speak by Yan Yixin because of his momentary consternation, and he was already in a hurry to answer at this time: "This line of yours just takes into account the harmony and unity of the two." In this way, the defect is close to the facet, and it can be removed when the next process is pondered. ”

The support of the two people almost made Yan Juan fluttering. Fortunately, she has always been introverted and introspective, and she knows how to be modest: "I just instinctively thought that this could be cut into two round brilliant diamonds, and I didn't think about it so much ......when I drew the line."

"Intuition is a rare instinct in gemstone design." Liu Li made no secret of his admiration for Yan Juan, "Although in recent years, the diamond-aided design breeding system integrated with computer three-dimensional simulation technology and digital camera technology has been used, and the work of drawing lines has become very simple. But the actual implementation may not be more accurate than the manual. Just like the laser sawing machine, although it saves labor and can cost materials, the real best diamond, who is willing to use this fully automatic way! ”

Yan Yixin also ignored Liu Li's passionate speech, and just calmly glued the diamond blank on the splitting drill pipe.

"Is this a split surface?" Yan Juan asked.

"Yes, notice the line? This ink line should be at an angle of about 20 degrees to the central axis of the splitting rod, and this side should be facing upwards, and then the groove should be engraved. Yan Yixin patiently explained.

"yes, I see." An has also done these processes, but he is not like Yan Yixin, who explains them thoroughly step by step.

No wonder Yan Yixin's explanation at that time couldn't even find fault with An, it turned out that he could be regarded as a chisel splitter himself! Yan Juan couldn't help but look at him sideways, but saw that he was looking at him with a smile, as if he had guessed what she was thinking, and shook his head: "I'm not a chisel splitter, but because of interest, I learned two tricks." ”

"Today, in order to show the beauty, I even secretly took out the drill billet! Don't believe him, if he can't be called a chisel, he dares to use diamonds as a demonstration for you today? Liu Li unceremoniously pulled his hind legs.

Yan Yixin was not annoyed, but still with a shallow smile, he began to carve groans.

Yan Wan was stunned: "I thought that only diamonds were used to chisel ......"

"Who said that?" Liu Li glared, "Although the sawing method is commonly used, the splitting method is not unavailable, but it is generally not a high-end gemstone, and it is not a big deal to waste that little bit of material, so with laser sawing, large and small splitters can take care of things." But cleavage or cotton locks, crack development of high-grade gemstones, is still very useful. The minimum cutting edge of the sawing method is 0.3 millimeters, how much weight loss do you think? ”

Yan Yixin smiled: "Splitting chisels is still too risky in comparison, and this shortcoming is enough for most jewelers to abandon it." In fact, the principle is the same, it is necessary to understand the cleavage or the degree and direction of crack development of the rough stone, and split it along the cleavage or crack direction, otherwise, new cracks will be generated, or even cracked into pieces. ”

"Other gemstones are less hard than diamonds, so they should be a little less difficult, right?" Yan Wan asked.

"Yes, so you learn how to chisel diamonds, and other gems will be as heavy as they are cut." Yan Yixin said with a smile, "The splitting technique of gemstones lies in being neat and sharp, using proper force, and trying to split into a cone or short prism. ”

"You want to learn to chisel? There really aren't many girls. Liu Li smiled evilly and suggested, "Why don't you take it over and learn to carve grooves?" This is also one of the basic skills! ”

Yan Yixin scolded with a smile: "Don't listen to Liu Li's nonsense, he didn't bring the tools with him, in fact, he can now use laser slotting, manual seam cutting is time-consuming and laborious, and the efficiency is very low. ”

Yan Juan let out an "oh", still with envy: "Can you make me ...... then?"

"Okay!" Yan Yixin didn't refuse, "Just cut it into a shallow notch like this." ”

Yan Juan nodded hurriedly, took over his work, and did it very attentively.

"Such a girl is rare, and I usually want to be a designer, but I don't have such a real thing." Liu Li raised his eyebrows in surprise, he didn't expect Yan Juan to be eager to try.

Yan Yixin glanced at him: "She was originally a different girl. ”

PS: Thank you for the update vote, but the little pig makes a small request, just vote for 3000 words...... Ahem...... So, that renewal ticket, just allow the little pig to ignore it strongly...... ^_^ roar, and the relatives continue to support the little pig!