Dr Luigi Constantini, geologist and gemologist with the International Gemological Institute Italy, has written The Slovak Opal: A Rediscovery of the Queen of Gems for Gem Lovers and Tourists.
The book describes the historical as well as mineralogical and gemological aspect of Slovak opal. The book also explains the classification of Slovak opal, quality grading with glossary and index for quick reference.
The book is available @ www.e-igi.com/estore
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