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Diamond from Jericho eclogite and Juina superdeep diamond
Diamonds from the Deep: How Do Diamonds Form in the Deep Earth?

G&G’s newest section explores how diamonds form in the deep earth.

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CVD, HPHT and Natural Diamonds
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Is There a Difference Between Natural and Laboratory-Grown Diamonds?

Learn about the differences – and similarities – between natural and laboratory-grown diamonds, and how GIA’s researchers and grading laboratories can tell the difference

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A Selection of Faceted Natural Ametrines.
Using Conventional Equipment to Separate Natural from Synthetic Ametrine

A summary of the article “A simple approach to separate natural from synthetic ametrine,” by Francine Payette.

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Appendix 2: Comparison of LA-ICP-MS and EPMA Data, Part 2

Comparison of LA-ICP-MS and EPMA Data, Part 2

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Appendix 5: Simplified Tourmaline Species Classification for LA-ICP-MS Data

Simplified Tourmaline Species Classification for LA-ICP-MS Data

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Appendix 4: Guideline for Simplified Distribution of Site Occupancy for LA-ICP-MS Data

Guideline for Simplified Distribution of Site Occupancy for LA-ICP-MS Data

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Appendix 3: Calculation Method for Tourmaline Species Classification Used Here

Calculation Method for Tourmaline Species Classification Used Here

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A New Method for Determining Gem Tourmaline Species by LA-ICP-MS

Presents a simplified but comprehensive classification of gem tourmaline species based on quantitative measurement of six common major elements.

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Appendix 1: Comparison of LA-ICP-MS and EPMA Data, Part 1

Comparison of LA-ICP-MS and EPMA Data, Part 1

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Details of two engravings representing the treasury of Aachen Cathedral.
The Talisman of Charlemagne: New Historical and Gemological Discoveries

Reveals new details about this historical jewel and the results of its first gemological analysis.

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