Where can someone start if they are interested in investing in jewellery? I encourage people to find what they like, whether it is an era, such as 1920s, 30s, 40s or Victorian; signed pieces (eg Cartier, Van Cleef); or coloured stones. Then they can start to look at these pieces more and more and build their skill for discerning what is quality and what is not. If you focus on an area, you can develop...