When people first encounter the world of coloured gemstones, they are often amazed by just what is available. Gems come in an amazing array colour, shapes and sizes. Where previously they might have thought that sapphires only come in blue or garnets red, they now discover that in fact they come in a whole spectrum of colours. They also might discover gems that they have never heard of before and surprised to find are far rarer and more precious then diamonds. Find out more about the many families of gemstones below.