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Recently, Mr. Li, the “sit-off shopkeeper†of the Guangzhou pawnshop, received a verbal notice from the manager: Stop accepting the pawn business of diamonds. Because of the recent period of time, the news that high imitation synthetic diamonds have flowed into the Guangdong market has caused the entire jewelry sales industry to be afraid.
However, compared with the prudence of pawn shops, some jewelry retail enterprises in Guangdong have been very calm in their interviews with the reporters of the Yangcheng Evening News. They said that the high imitation synthetic diamonds did not flow into the circulation field, and they did not have to be arrogant.
How is the high imitation synthetic diamond in the end, can it set off such a big wave in the industry?
Some pawnshops give up the diamond pawn business
The pawnshop where Mr. Li is located is a pawnshop of medium-sized and above in Guangzhou. Diamond's pawn business has always occupied a large share.
Mr. Li holds the qualification certificate of the National Jewelry Quality Inspector. His task is to check the items sent by the client. "But look at our testing equipment, the three treasures on the counter: microscope, hydrometer, densitometer, high imitation synthetic diamonds can only be identified by means of professional spectroscopic instruments, our 'three treasures' can not be detected. We accept the pawn It is generally a large diamond of more than 1 carat. If you accidentally receive a synthetic diamond, you will lose money."
Mr. Li said: "The emergence of such high imitation synthetic diamonds has already made the entire jewelry sales industry feel fearful. Whoever takes this out, will become the public enemy of the industry."
CVD synthetic diamond detection is very difficult
But in the eyes of some jewelry retailers, Mr. Li’s reaction is a bit too radical. Hu Xuenian, a national registered jewelry inspector and a senior engineer of Guangdi Jewelry Company, told the Yangcheng Evening News reporter: "Synthetic diamonds have been there in the morning, but all the previous ones are some one or two small diamonds. The recent appearance is relatively large. However, this batch of things has already been discovered in the testing process, and should not enter the circulation field of Guangdong."
It turned out that this year's "3.15" consumer rights day, Guangdong Province, jewelry and precious metals and precious metals testing center broke the news: last year the center detected CVD (Chemical Vapor Deposition chemical vapor deposition) synthetic diamonds more than 100, this The synthetic diamonds are not from individual customers, but from a shipowner who claims to be engaged in the diamond trade. He took out more than 100 large diamonds and asked the inspection station to test and produce the results.
The staff used two new equipment purchased three years ago but had never had the opportunity to use it and found that more than 100 diamonds were all "CVD synthetic diamonds".
How high is this kind of CVD synthetic diamond? Hu Xuenian said: "The CVD synthetic diamond has no difference in chemical composition, crystal structure, optical properties and physical properties from natural diamonds. It cannot be seen by the naked eye. It is necessary to use professional The instrument, combined with multiple parameters, and multi-faceted verification, can make a correct judgment. If using conventional instrument testing, it is possible to look away."
Nationally, CVD synthetic diamonds have also attracted industry attention. The Yangcheng Evening News reporter learned from the China Jewelry and Jade Jewelry Industry Association that as early as last year, the National Jewelry Quality Supervision and Inspection Center found two batches of CVD synthetic diamonds in daily entrusted inspection. The Association's Jewelry Appraisal and Evaluation Professional Committee also specifically announced that we hope to prevent it.
According to the relevant person in charge of the Guangdong Jewelry and Precious Metal Testing Center, the detection of CVD synthetic diamonds is very difficult. At present, there are no more than 15 jewelry testing institutions with synthetic diamond detection capabilities in China.
CVD synthetic diamonds flow into Hong Kong through Hong Kong
So where does CVD synthetic diamond come from? Hu Xuenian said: "There is no such technology in China for the time being."
The Yangcheng Evening News reporter learned from the China Jewelry and Jade Jewelry Industry Association that the two batches of CVD synthetic diamonds discovered by the National Jewelry Quality Supervision and Inspection Center last year were sourced overseas and mainly entered the domestic market through procurement channels in Hong Kong.
However, the two batches of CVD synthetic diamonds discovered by the National Jewelry Quality Supervision and Inspection Center last year were mistaken for the purchase of natural diamonds by diamonds in the Mainland. The diamonds themselves did not bear the mark of the waist, and the suppliers did not attach any explanation.
Low imitation diamond
“The cost of its practical CVD synthetic diamonds to counterfeit natural diamonds is also quite high.†Yangcheng Evening News reporter learned from the China Jewelry and Jade Jewelry Industry Association that the international trading rules for CVD synthetic diamonds using natural diamonds are generally wholesale. Natural diamonds are about 10% lower.
Yesterday, the Yangcheng Evening News reporter visited a number of diamond retail enterprises and counters in Guangzhou, and found no public sale of synthetic diamonds. But on Taobao, a search for "synthetic diamonds", there are tens of thousands of goods immediately, basically Mosang stone and zircon products. The most popular is the ring inlaid with Moissanite. For example, a ring with a recent sales of over 1,000. The price of 1 carat is 369 yuan, the price of 2 carat is 422 yuan, the price of 3 carat is 487 yuan, 4 carats. It is 572 yuan.
Hu Xuenian told reporters: "Mosang stone is not a natural ore. Its scientific name is synthetic carbon silica; the imitation drill called 'zircon' on the market is actually a synthetic cubic zirconia, which is a popular one in the early years. The 'Su Drill' of time. Zircon is actually another natural ore."
Although it is also a replica of natural diamonds, CVD synthetic diamonds can be called simulated diamonds, while moissanite and synthetic cubic zirconia can only be called imitations. Because both physical and chemical properties, the latter two are not as realistic as CVD synthetic diamonds.
"If it is Moissanite, give me a magnifying glass, I can see it with the naked eye. Its facets will have a sharp shadow; synthetic cubic zirconia is easier to identify, its simulation is not so high, and the cost is low. The particles are large and flickering and are now used in large quantities on clothing."
In response, many consumers interviewed said: “Whether it is a high imitation CVD synthetic diamond or a low imitation Moissanite, it gives consumers a little more choice at a relatively cheap price. This is what consumers are willing to accept. However, the key is not to be able to confuse the truth.†Hu Xuenian also reminded that diamonds that are unclear must be carefully purchased. For the diamond jewelry that is officially sold, it is also necessary to carefully check whether it is accompanied by an appraisal certificate issued by an authoritative organization. Good choice of reputable businesses.
CVD synthetic diamond
what exactly is it?
According to Hu Xuenian, there are two main types of synthetic diamond technology in the world. One is GE Diamond, which is produced by American General GE Company using high-pressure high-temperature method. This synthetic diamond has GE mark on the waist. To distinguish it; the other is CVD synthetic diamond, which is produced by chemical vapor deposition. The shape of natural diamonds is octahedron or rhombohedral 12-faced body. The CVD diamonds cultivated in the laboratory are plate-shaped, but after cutting, the shape is the same as that of natural diamonds.
As early as 1952, the United States Federal Silicon Carbide Company successfully developed in-phase epitaxial growth of diamonds with carbon-containing gas under low pressure conditions, but at that time CVD method grew diamonds very slowly. At the Diamond International Conference held in Japan in May 2005, laboratories in the United States have disclosed that they have been able to grow 5 to 10 carats of CVD synthetic diamond single crystals at high speed (100 micrometers per hour). This means that the conditions for large-scale commercial use of CVD synthetic diamonds have matured.
High imitation CVD synthetic diamonds have entered the market in large quantities?
Abstract Recently, Mr. Li, the “sit-off shopkeeper†of the Guangzhou pawnshop, received a verbal notice from the manager: Stop accepting the pawn business of diamonds. Because recently, the news of high imitation synthetic diamonds flowing into the Guangdong market has made the entire jewelry sales industry...