Researchers at the Gemological Institute of America (GIA) have been scared to stunned after discovering the flaws of synthetic diamonds found in natural diamonds. Gia gemologist Troy Arden and senior research scientist Christopher Brand published an article in the organization "German and Gemology" in the "Spring 2017" magazine, saying they were "very surprised" in a chemical vapor deposition (CVD) H4 defects were found in manufactured synthetic diamonds. It is pointed out that the H4 defect is one of the most common defects in natural diamond. It consists of four nitrogen atoms and two vacancies. This is the first time the laboratory has found this phenomenon in CVD synthetic stone. This round, dazzling 0.26-carat pink CVD diamond was submitted to GIA's Carlsbad lab in California for a man-made colored diamond grading report, which was then returned to the owner and attached to the request. report. In this paper, nitrogen is the most abundant impurity in diamond. In the growth or post-growth treatment of synthetic diamond, H4 defects are difficult to achieve.
The article reads: "This diamond is grown with a nitrogen-doped gas that can be added to the diamond lattice in a single alternative to nitrogen." This CVD synthetic diamond has a low total nitrogen content and is grown under vacuum. Irradiation and annealing are likely to occur at atmospheric pressure, which makes the occurrence of H4 more puzzling. Breeding tells jewelers that although this discovery is "interesting in science," its findings have not affected the identification of artificial stones. "The scientific value of this discovery is that it shows that a major diamond defect (H4), a complex aggregated nitrogen impurity believed to be formed only in natural diamonds, can be formed by another mechanism." "However, all known The standard for identifying synthetic diamonds is still valid, and we believe we have the ability to distinguish all synthetic diamonds from natural diamonds,†he added. The conclusions drawn here are that H4 defects are produced during irradiation and annealing, but it states that "this is the first observation of this defect in CVD synthetic diamond in many samples tested by GIA."
The 5.03 carat stone was unexpectedly found to be the largest faceted blue composite by GIA. In the past year, GIA has announced several "important" discoveries of synthetic diamonds. As previously reported by the jeweler in May 2017, a blue synthetic coated natural diamond was discovered, the first time the organization discovered the diamond. The grading laboratory also confirmed an undisclosed 5.19-carat CVD synthetic diamond in October 2016 - the largest such diamond reported in the industry. This was done several months after testing a jade-cut high-pressure high-temperature (HPHT) diamond; the diamond is said to weigh 5.03 carats and is the largest blue synthetic stone ever tested by GIA.
Referring to the relationship between CVD and HPHT technologies and the industry, GIA has pointed out that chemical vapor deposition technology has accelerated in recent years to produce large, high quality, colorless and nearly colorless synthetic materials. In March 2016, it was also pointed out that the rapid development of HPHT technology will "finally affect the jewelry industry."
Cable Charging Night Lights, Charging Bedside lamp, Charging Night Light, Bulid-in Battery night light, Tool free installation lights, nursery light
Ningbo Deamak Star Intelligent Technology Co., Ltd , https://www.deamakstar.com