Tag Archives: Subduction Gemstone

Plate Tectonic Gemstones: Jadeite, Ruby, and Diamond – Robert Stern

Posted on October 30, 2014 by dcgiaorg

Professor Robert Stern provided the chapter members with a a very informative discussion of how gemstones form in a variety of geologic settings. Plate Tectonic Gemstones – Geology 2013 Almost all gems of mineral origin form in the Earth’s crust, with … Continue reading →

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