3751231
9780878422173
To the surprise of many, the United States has emerged as a commercial source of what some gem experts consider the world's finest sapphire. Equally surprising is that the entire production of the gem comes from a little-known Montana mine named Yogo, whiVoynick, Stephen M. is the author of 'Yogo: The Great American Sapphire' with ISBN 9780878422173 and ISBN 087842217X.
[read more]