A Guide to Gem Classification - International Gem Society

Gemologists use several different gem classification methods. Learn how the most common systems work and what they cover as well as exceptions to the rules.

List of Gemstones: Precious and Semi-Precious Stones - Gem Society

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Gemstone Guide: Classification of Gemstones - Geology In

List of Gemstones: Precious and Semi-Precious Stones - Gem Society

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A Guide to Gem Classification - International Gem Society

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How Well Do You Know Your Gem Types?

How to Identify Gemstones (with Pictures) - wikiHow

International Gem Society –

Course Materials: Gemology - International Gem Society IGS

How Well Do You Know Your Gem Types?