Living in a diamond mining town, I found this of immense interest....
LINK: http://www.scmp.com/business/companies/article/2076225/de-beers-fights-fakes-technology-chinas-lab-grown-diamonds (http://www.scmp.com/business/companies/article/2076225/de-beers-fights-fakes-technology-chinas-lab-grown-diamonds)
QuoteThe spread of synthetic diamonds in China, originally designed for industrial purposes such as oil drilling, is posing such a threat to the global diamond market that it has forced dominant player De Beers to invest tens of millions of dollars on methods to identify the man-made stones that look exactly like the real thing.
A team of scientists at the mining giant are dedicated to fundamental research into the difference between synthetic and natural diamonds, while others work around the clock developing high-tech machines capable of screening out these tiny, "fake" gemstones, a popular investment among jewellery makers, particularly for those in China and India.
Rest of article at link.