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Tourmaline

Tourmalines have a wide variety of exciting colors with one of the widest color ranges of any gem.

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26.32-ct.

This 26.32-ct. oval pink tourmaline is from Mozambique.

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Rubellite

Trade name for pink, red, purplish red, and orangy red tourmaline.

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Inclusions

It’s not unusual for pink tourmalines to have eye-visible inclusions.

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California

This beautiful tourmaline mineral specimen is from California.

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Columnar Form

The specimen displays tourmaline’s characteristic columnar form.

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Fantastic Crystal

Fantastic pink tourmaline crystal with quartz with other minerals.

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Tools

Research

Looking down the crystal axis of a backlit 58.83 ct trapiche emerald
Article
Emerald: The Superstar of Trapiche Gemstones

Trapiche emeralds, which display a distinct six-spoke wheel pattern, set the standard as some of the finest and most spectacular crystals unearthed.

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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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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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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 3: Calculation Method for Tourmaline Species Classification Used Here

Calculation Method for Tourmaline Species Classification Used Here

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

Simplified Tourmaline Species Classification for LA-ICP-MS Data

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A man and woman shake hands during a career fair event. In the background is a GIA poster.
Article
Adapting to Changing Workplaces

GIA Career Service advisors offer tips on how to navigate the changing workforce and consumer attitudes for success in the gem and jewelry industry.

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Man sits next to microscope.
Article
Tucson Visit Spurs Geology Professor, Publisher to Head Back to School

Geologist, publisher earns his GG so he can share more information on gem materials with visitors to Geology.com, his Earth Science website.

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Woman holds multiple strands of black cultured pearls.
Article
‘Pearl Goddess’ Pours Experience, Support into GIA Alumni Association

Betty Sue King shares her expertise at chapter meetings, on pearl trips and with donations to the Tucson auctions – all in support of the GIA alumni.

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