Luo Tian saw what was inside clearly and felt excited: "Diamonds? Oh, loose diamonds?" To be precise, they are loose diamonds, which are single diamonds that have been cut, polished, but not inlaid.
The most important thing is the cut. Cut is the only one of the 4Cs of loose diamonds that can be done manually. It directly affects the brilliance of the loose diamond. Only good cut can show the brilliance.
The so-called 4c refers to weight, color, clarity (also known as whiteness) and cut. Therefore, diamonds are also divided into grades. Perfect, minimal flaws, and small flaws have completely different values.
The diamonds here are of the same whiteness. The reason why Luo Tian is so sure is because diamonds with different whitenesses will have different prices even if they weigh the same, so they will never be mixed together.
The grades of loose diamonds are: d, e - extremely white, f, g - excellent white, h - white, i, j - slightly yellowish white, k, l - light yellowish white, m,
n color - light yellow, from high to low.
"Yes, these are loose diamonds?" Niu Jianjun said excitedly: "These are the loose diamonds that I want Mr. Luo to see."
Luo Tian understood a little bit. This was really a visit to the Three Treasures Palace for nothing. It seemed that he came to his jewelry store. This was the supplier who came to his door. Although it was not a black diamond, Luo Tian was still very excited.
, this is another raw material channel. Niu Jianjun took out a magnifying glass and tweezers, which are two basic tools for inspecting loose diamonds.
The best tool for inspecting loose diamonds is to use a cloth eye. The so-called cloth eye is a magnifying glass that can be clamped on the eye. It is usually ten times magnifying. Generally, diamond dealers will look down upon customers who can use cloth eyes.
At a glance, of course, some people have been around in the diamond industry for a long time and can tell the difference with the naked eye.
What Niu Jianjun handed Luo Tian was a ten-fold magnifying glass. Looking at the small tweezers, Luo Tian's heart really trembled. Don't make a fool of yourself accidentally. Luo Tian carefully picked up a loose diamond with the tweezers and placed it under the magnifying glass.
Good standard cut!
Above the waist are 8 quadrilateral faces, 8 isosceles triangular faces, 16 (8 pairs) triangular faces with one arc edge and an octagonal top plane (called the table), called the crown. Below the waist
It is called the pavilion, which consists of 16 (8 pairs) long triangular faces with an arc edge, 8 slender quadrilateral faces and one (some broken diamonds under 5 points do not have this face) to deform the bottom plane.
(called the bottom surface).
In standard cuts, the angle between the crown bevel and the top plane (the upper and lower planes are parallel, but since the bottom plane is generally not visible to the naked eye, there is an additional top plane as the benchmark) is 34.5 degrees. The two top planes are
The distance between two opposite corners is 53% of the waist circle diameter. The angle between the pavilion slope and the top plane is 40.75 degrees, and the angle between the two opposite pavilion slopes is 98.5 degrees.
Just looking at this string of data, it is definitely impossible to judge immediately with a pair of naked eyes, but humans are intelligent animals after all, so they also have their own set of methods. What Luo Tian is doing now is to use this artificial method to make judgments.
What he looked at under the magnifying glass was, firstly, whether each facet of the diamond was symmetrical and whether the table area was appropriate, that is, the tabletop and 8 isosceles triangles formed a superimposed figure of two approximate squares. If the table size had been determined to be
After the standard size, turn the table up and look through the table at the quadrilateral surface of the pavilion. If the width of the quadrilateral surface of the pavilion seen in the quadrilateral surface of the crown is twice the width seen from the table, then the angle of the crown is
It is close to the standard size. If the length of the quadrilateral surface of the pavilion seen through the table accounts for 1/3 of the actual length, then it means that the angle of the pavilion is also correct. If the middle of the pavilion is black when viewed from the table, it means that the pavilion is
The angle is too steep.
Diamonds are different from antiques. Diamonds need standards. The higher the standards, the higher the value. Luo Tian deeply understands this truth, so he looks at it very carefully to ensure that every standard is not missed.
Finally, he put the diamond back into the black velvet bag, put down the magnifying glass in his hand, and breathed out: "f, g color - excellent white."
Niu Jianjun glanced at Yuan Senlin, with great surprise in his eyes, and then nodded: "Yes, this batch is all excellent white, I carefully selected it and brought it here."
"The quality is very good. After all, there are too few loose diamonds that fully meet the 4C standard." Luo Tian recognized this batch of loose diamonds. He smiled slightly: "You two came all the way from the Northeast, so you definitely didn't want me to be sure.
Is the level that simple?”
"Mr. Luo, I have been involved in the loose diamond industry for more than a year, and I am very sincere in developing this area. But as you know, success in this industry does not depend on having a correct attitude or having good loose diamonds.
Yes, compared with other competitors, I have fewer channels." Niu Jianjun was a little excited and sweat broke out on his forehead.
Luo Tian understood in his heart: "I can understand that as a jewelry company, we also need good raw materials and a good supply chain."
"Yes, I let Mr. Luo look at this batch of loose diamonds because I hope Mr. Luo will consider our company. Although our company started late, we have always been strict in quality control." Niu Jianjun is full of expectations: "We welcome door-to-door inspections at any time.
Luo Tian said "Oh": "Wafangdian, Liaoning is the hometown of diamonds in China."
This made Niu Jianjun very excited: "Yes, among the diamonds produced in China, the highest quality ones are those produced in Wafangdian. Mr. Luo is indeed very knowledgeable."
When it comes to the origin of diamonds, the first thing most people think of is South Africa. Worldwide, famous diamond origins include Australia, South Africa, Zaire, Botswana, Russia and other countries. However, China does not have no diamond origins, but its texture
It’s just that it can’t keep up with these places of origin in terms of reputation.
China's proven diamond reserves and output rank around 10th in the world, with an annual output of 200,000 carats. Diamonds are mainly produced in Wafangdian, Liaoning, Mengyin, Shandong, and the Yuanjiang River Basin in Hunan. Among them, Wafangdian, Liaoning is currently the largest diamond mine in Asia.
mine.
The diamonds produced in Wafangdian, Liaoning, Mengyin, Linshu, Shandong, and Yuanshui basin in Hunan are all kimberlite type, but primary mines have not been found in Hunan. Among them, the quality of Liaoning is good, and the size of Shandong is larger. Currently, the largest diamonds discovered in my country are The diamond is the Changlin Diamond, which was discovered in Shandong on February 21, 1977. It was discovered by Wei Zhenfang of the Changlin Brigade, so it was named "Changlin Diamond". It is now in the bank treasury. The Changlin Diamond weighs 157.786 carats and is octahedral. The texture is clean, transparent and light yellow.
It is also rumored that the largest diamond in China was once the Golden Rooster Diamond, which was also found in the area and weighed 217.75 carats. However, it was looted by the Japanese army during World War II and its whereabouts are still unknown.