Diamonds may be a girl’s best friend, but unfortunately, the billion-dollar diamond industry is rife with scandal and fraud. There have been a number of cases where lab-grown diamonds have been graded as natural diamonds. An example of this was seen last year when the International Gemological Institute analyzed and graded a 6.18ct lab-grown diamond, which was previously claimed to be a natural diamond on its Gemological Institute of America (GIA) report. It was also reported in 2005 that the Gemological Institute of America — which is one of the most trusted sources for evaluating gemstone quality — was accepting …