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Geology of Rubies

There’s an interesting article about the Geology of Rubies in the
current (November) issue of Discover magazine.

Discover Magazine
http://www.ganoksin.com/jewelry-books/us/product/B00005N7PT.htm

Subscription price: $19.95

Courtney Graham Hipp
cgHipp Jewelry Designs
http://www.cghipp.com