To simplify your pursuit of gemstone knowledge, the varieties discussed in this book will be described in the mineral species. The reason for doing it this way is that each variety of a particular mineral shares common physical and optical properties.
To narrow the list to twenty or so minerals to learn about is far simpler than learning about a hundred or so varieties separately. Gemstones may be known by a common name or by a varietal name; some of the names in this list are actually incorrect in a mineralogical or gemological sense, but this list has been compiled to help you find a particular stone you may be interested in.
By Sondra Francis
About the Author
Sondra Francis has scoured every major colored gemstone market in the world since 1978. She was a charter member of the American Gemstone Association and served as a board member. She was a founding member of the International Colored Gemstone Association. A true gem lover, Sondra has marketed her treasures on the wholesale and retail markets.
Acknowledgments: A special thanks to Pam Dulgar, Alex Edwards, Cheryl Kremkow, Kate Kirby, Helen Mitchell, Carol Morgan Page, David Pond, Elaine Proffitt, and Ray Zajicek for their help.
Photographs: Bart Curren and ICA Gembureau ; Alex Edwards, Pearl Sales Institute ; David Dikinis