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Diamonds vs coloured gemstones Rough&Polished correspondent Sergey Goryainov sat down for a talk with Professor Andrey Ametistov, a Russian gemologist to discuss similarities and differences between the diamond market and coloured gemstones market. Over the past five years, the technologies for the synthesis of gem-quality diamonds have been developed by leaps and bound and there has been a corresponding industrial and commercial boom, as a result, the supply of high-quality large-sized synthetic stones is growing exponentially, the synthetics’ production cost is falling, and it can be said with a high probability that this process will develop quite fast. The diamond market has never seen such a situation before in its history unlike the market for coloured stones where high-quality synthetics at a relatively low production cost have been present for many decades. What is the situation today with the jewellery synthetics expansion on the coloured stone market? ....