For decades, Hong Kong has been a hub for gold jewellery. Brands such as Chow Tai Fook and Chow Sang Sang have drawn buyers from the world over, aided by the city’s duty-free status and its proximity to one of the world’s largest gold-consuming markets. Two years ago, when officials set the goal of making Hong Kong a global gold trading hub comparable to New York and London, it was met with scepticism. Similar efforts in the past had ended in failure. The doubts, however, began to fade in early...