Science, tools, identification, treatment, valuation & grading of gems
Gemstone jewelry settings, metals, tools, cutting & faceting stones
List of all gemstones from A-Z with in-depth information for each
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Everything you need to know about buying your perfect diamond
Learn more about these popular gemstones, their meaning & about buying birthstone jewelry
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In-depth guides to quality factors of the 40 most popular gemstones
"Iolite, Yellow/Brown Direction" by David Abercrombie. Licensed under CC By-SA 2.0.
Article: What is Gemstone Pleochroism?