We cut a 428 carat lab-grown sapphire with our 60,000 PSI waterjet ... Extraordinary' Djokovic levels match at a set apiece ‘Green scam’: Donald Trump ‘pulling out’ of Paris climate ...

Figure 1. This 1.83 ct specimen proved to be a manufactured product consisting of lead glass and natural green sapphire. Photo by Robison McMurtry. In recent years, one of the most problematic gem ...