The Russian company New Diamond Technology (NDT) yesterday presented an emerald-cut blue diamond, 5.03-carat, VS1 high-pressure, high-temperature (HPHT) type-IIb stone at BaselWorld. It is the largest synthetic blue diamond to date and was certified by the International Gemological Institute (IGI). NDT is one of the founding members of the new International Grown Diamond Association. It’s also the company that produced the world’s largest known colorless diamond, a 10.02-carat, F color, VS1 stone cut from a 32.26-carat piece of rough and submitted to IGI Hong Kong last year. Michelle Graff of National Jeweler informs that the Gemological Institute of America’s New York laboratory recently evaluated the diamond.
The Lab Note reads, "This emerald-cut synthetic diamond was color graded as Fancy Deep blue. This is a very attractive color with no other color component, a prized rarity among natural type IIb diamonds (the Blue Moon, for instance, was graded as Fancy Vivid blue)." It states that the 5.03-carat diamond exhibited a number of traits characteristic of diamonds grown using the high-pressure, high-temperature (HPHT) process, including color zoning and a cuboctahedral growth pattern. It also notes, "As the size and quality of synthetic diamonds improve, careful identification is essential. Representative HPHT synthetic diamond characteristics ... can be detected using a gemological microscope, emphasizing its continued importance in gem identification. Examination of this large IIb synthetic diamond, combined with those previously reported from NDT, illustrates the rapid progress in HPHT growth technologies. This is a development that will eventually impact the jewelry industry."
As PRNewswire reports, Marc Brauner, co-CEO IGI Worldwide, says, "This 5.03 carat stone is unique in all aspects, and that the science and technology behind the processes synthesizing this stone are rapidly and significantly advancing." NDT's president Tamazi Khikhinashvili says, "Our aim is to take a rightful place in the market of lab-grown diamonds as we gain increasing interest from the worldwide jewelry industry. The opportunities are unlimited! Thanks to the establishment of International Grown Diamond Association (IGDA), our business becomes even more transparent and reliable."