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Geology 101: Natural Processes that Form Colored Gemstones | GIA Knowledge Sessions Webinar Series
GIA Knowledge Sessions Webinar - recorded live on July 2, 2020. What makes a gemstone rare and why are some gems rarer than others? The answer lies in gemstone geology. Some gems, such as emerald, require extraordinary geologic circumstances to form. Not only do different rock types need to meet under the right conditions and crystallize ...
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