Discover the history of precious, semi-precious, and organic gemstones, their scientific properties, their mythical powers, and their traditional uses. Humans have been beguiled and fascinated by gemstones and crystals since prehistory, and made use of them for everything from currency and ceremonial decoration to tokens of love or power. But why have some been considered more significant than others – rare or otherwise?  Learn all about the key characteristics of precious and semi-precious stones, and discover the science behind some of their more unusual and mysterious properties, and...