Branko Deljanin (“Gemmological Research Industries”, Canada)
- Date: April 9, 2021
- Length: 58m
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 on the market that use different methods for screening/detection, and results of 10 devices testing 55 diamonds of different origins will be presented. Each member of the trade has specific needs on type of item to be tested (loose or mounted, size and colours), the number of items needed to be tested per hour and the accepted tolerance on accuracy, as well as the budget.
Branko Deljanin, B.Sc. FGA, GG, DGA is President and Head Gemologist at CGL Canadian Gemlab and Director of Gemmological Research Industries (Canada). Since 1999 when he detected first coloured HPHT enhanced diamonds on the market, he has spent a great deal of time studying HPHT treatments of natural diamonds and ID of synthetic diamonds (HPHT and CVD), and natural pink diamonds. In 2001 he earned his Advanced Gemology Diploma (DUG) from the University of Nantes in France, on the subject “Identification of HPHT treated diamonds”. Deljanin is an instructor of advanced gemology programs on diamonds and gems offered at workshops in 17 countries and via on-line practical seminars and webinars.