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- Feb 29, 2012
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P.S. Stephen Voynick's book, Yogo: The Great American Sapphire, is the source of much of the information on the Wikipedia page. I enjoyed it immensely & you might like to read it too:
https://www.amazon.com/Yogo-American-Sapphire-Stephen-Voynick/dp/087842217X
There are a number of second-hand copies on eBay:
https://www.ebay.com/sch/i.html?_productid=292398&isRefine=true&LH_ItemCondition=2500|3000|4000|5000|6000&sl_ready=true&_sop=15
ETA article on The Yogo Sapphire Deposit from the Spring 1995 issue of GIA's Gems & Gemology journal:
https://www.gia.edu/doc/The-Yogo-Sapphire-Deposit