The chemical synthesis of diamond "Li Gui" can be chaotic. Industry experts say that the instrument can detect the authenticity.

At the end of June, there was media exposure from Hong Kong to the mainland two batches of "Chemical Synthetic Diamonds". This synthetic diamond has a high degree of simulation and is difficult to distinguish by the naked eye. In this regard, the author recently visited Bao Yong, head of the jewelry appraisal department of the Quality Inspection Bureau of Yantai City, Shandong Province. According to Bao Yong, as early as May 23 this year, the China Jewelry and Jade Jewelry Industry Association issued a “Notice on the Discovery of Synthetic Diamonds by Chemical Vapor Deposition in the Domestic Diamond Market” in the industry. It is said that in the recent daily entrusted inspection, the National Jewelry Quality Inspection Center has successively discovered two batches of chemical vapor deposition synthetic diamonds. Because such synthetic diamonds are very similar to natural diamonds, it is difficult to be natural and natural in the detection process. Diamonds are differentiated and all members of all appraisal and evaluation professional committees are notified to remind their units to take precautions. Bao Yong told the author that the two batches of synthetic diamonds tested by the National Jewelry Quality Inspection Center Laboratory were mostly around 0.50 carats, and the color level was mostly in IJ color, almost colorless. The clarity is mostly in VS, and the black inclusions are visible inside, similar to the inclusions in natural diamonds, and have no metallic luster. After the instrument is tested, there is no fluorescence under long-wave ultraviolet light, weak or very weak fluorescence under short-wave ultraviolet light, and no phosphorescence. “This kind of diamond is difficult to distinguish from ordinary natural diamonds under the naked eye or under the microscope.” “For a long time, the imitation of diamonds in the industry is generally cubic zirconia and synthetic silicon carbide. Synthetic silicon carbide is almost a semiconductor material like diamond. Known as high imitation diamonds, the new 'synthetic diamonds' have surpassed synthetic silicon carbide. The quality is very similar to that of natural diamonds. It is invisible to the naked eye, but it can be easily detected by the equipment." Introduction. "The source of these 'synthetic diamonds' is overseas, mainly through the procurement channels of Hong Kong to enter the mainland market." Bao Yong said that according to the regulations, "synthetic diamonds" must be marked on the diamond waist when it is put on the market. However, the batch of "synthetic diamonds" was not marked, the diamond itself did not bear the waist mark, and the supplier did not attach any instructions. However, consumers do not have to worry too much. Baiyun Long, general manager of cherished diamonds, believes that whether it is "synthetic diamonds" or "diamond substitutes" made of cubic zirconia and synthetic silicon carbide, it is nothing new. “The technology of synthetic diamonds began to appear in the 1950s and was mainly used in industry. In the past few years, it was discovered at the time of purchase that synthetic diamond technology began to be used by some unscrupulous merchants. Under high temperature and high pressure, it can be used in methane. The carbon molecules are continuously deposited on the rough diamonds, which make the diamonds proliferate layer by layer, and can produce synthetic diamonds weighing up to 10 carats.” “The synthetic diamonds found in this batch are yellowish white, from the whole market. The common color level, and the clarity of the VS level is also the common level of clarity in the market, indicating that illegal traders are also catering to market demand.” To prevent the move, Baiyunlong reminds consumers to choose internationally when buying diamonds. Diamonds for identification certificates, national inspection certificates and city inspection certificates must retain the proof of purchase. If there is any doubt about the diamonds purchased, they can also go to the relevant quality inspection department for identification and testing.

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