Considering the occurrence of undisclosed lab-grown diamonds, vigilance combined with the use of standard and advanced gemmological tools are critical to ensure confidence in the supply line. While well-equipped labs can identify such non-natural origin and issue a report accordingly, diamond dealers, gemmologists, appraisers and retailers need instruments that help them to screen natural and some cases identify lab-grown diamonds. There are an increasing number of detection instruments and machines (see table 1 below) on the market that use different methods for screening/detection, notably:
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- transparency to SW UV light
- characteristic fluorescent/phosphorescent reaction to LWUV, SWUV and other UV light
- Vis, PL, Raman, FTIR and fluorescence spectroscopy
- fluorescence imaging and other undisclosed techniques
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Comparison_of_portable_instruments_for_screening_and_ID_of_Lab-Grown_Diamonds.pdf