Gemstones, including rubies, emeralds, and sapphires, can be sold for cash, much the same as diamonds and other jewelry. However, more often than not, those stones have very little resale value, ...

Doris Hangartner invites readers of her coffee table book Gem Love Letters to open it randomly and be drawn to the coloured stone that resonates with them most. The Zurich-based gemmologist says it’s ...