Written specifically for jewellers, this guide can live on the bench ready to answer queries when designing or working on a piece of jewellery and includes some gemmological information which could help avoid these moments. Covering familiar stones such as amethyst through to the more unusual such as sillimanite, each gemstone has information about its durability and whether it might survive a swipe from a file or abrasive wheel, the pickle pot, repairing or resizing, polishing or cleaning using steam or an ultrasonic cleaner.