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Some of the worldโs biggest jewellery and gemstone companies are taking part in Jewellery & Gem WORLD (JGW), previously known as the September Hong Kong Jewellery & Gem Fair, from 27 to 30 September in Halls 3 to 6 of the Singapore EXPO. The fair will present the newest products of around 1,000 exhibitors from close to 30 countries and regions.