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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

A large group of people outside on GIA’s Carlsbad, California  campus.
Article
Guardians of Trust: GIA’s Innovative Research, Instruments and Services

GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems enter the market.

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The octopus head is a baroque Tahitian cultured pearl and its arms are made of black, yellow and white diamond (in a striped pattern) set in black-plated 18K gold.
Article
A Tropical Paradise of Ocean-Inspired Jewelry and Gemstones

Escape to a warm-water paradise in your mind with these jewels that formed in the sea, are inspired by marine life and evoke the ocean’s essence.

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People meet and mingle at the entrance to the JCK Show.
Article
Headwinds Slow 2019 Vegas Business, Lab-grown Diamonds Proliferate

Decent demand for finished jewelry, but less for loose gems. Plus: Lab-grown diamonds and responsible, sustainable business practices.

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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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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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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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