IGI Grades Bicolor Lab-Grown Diamonds
June 4, 2023 | Leah Meirovich
"The International Gemological Institute (IGI) has analyzed two lab-grown diamonds containing separate sections of blue and yellow coloring.
The bicolor stones were grown by Meylor Global, a Kyiv-based company, using High Pressure-High Temperature (HPHT), IGI said Saturday. The first stone, a radiant-cut, 4.38-carat, VVS2-clarity polished diamond has a color described as fancy-deep-greenish blue. The 10.96-carat rough diamond also displays specific blue and yellow color zones, the lab noted. The stones’ coloring is a nod to Meylor’s home country of Ukraine.
“The blue and yellow are described as ‘greenish’ because natural and lab-grown fancy-colored diamonds are traditionally assessed with all hues, tones and saturation considered collectively,” said Steve Rees, executive director of IGI’s North American grading lab. “What’s observed here is deliberate, specific color separation…the first of its kind we’ve seen.”
The lab determined traces of nitrogen in the yellow portions of the diamonds using spectroscopy. Meanwhile, Meylor used ... "
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