The International Gemological Institute (IGI) has established a set of procedures to separate fancy-coloured natural diamonds from lab-grown diamonds.
Using advanced techniques such as Fourier transform infrared spectroscopy (FTIR) and photoluminescence spectroscopy along with magnification, IGI can successfully separate fancy-coloured natural diamonds from fancy-colored lab-grown diamonds for each colour category, whether loose, in parcels, or mounted in jewellery.
According to the lab, traditional screening devices generally use photoluminescence to capture a diamond’s fluorescence and phosphorescence under ultraviolet light. However, that method often does not work with fancy-coloured lab-grown diamonds because the stones may be treated with irradiation, heat and pressure, which alters their fluorescence and phosphorescence.
Tehmasp Printer, CEO of IGI said: “IGI uses the latest technology to ensure that each diamond is graded accurately and identified correctly as natural, or lab grown. With lab-grown fancy-coloured diamonds gaining momentum and the differential pricing being substantial, it is imperative that the screening is done by a reputed laboratory like IGI. We had a few cases in recent times where there has been a contamination of natural fancy-coloured pink diamonds mixed with lab-grown pink diamonds. We strive to ensure that consumers have the right to accurate and authentic information about the diamonds they are purchasing.
IGI has developed the D-check in the interest of transparency and peace of mind for the industry and consumers alike. Our commitment to accuracy and transparency in the certification process is reflected in strict adherence and regular calibration of our international standards and testing methods across our worldwide locations.”
07-03-2024
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