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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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Polished
Rough

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Research

A large group of people outside on GIA’s Carlsbad, California campus.

Article

Guardians of Trust: GIA’s Innovative Research, Instruments and Services

Russell Shor, September 20, 2019

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

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

Sharon Bohannon, August 9, 2019

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.

People meet and mingle at the entrance to the JCK Show.

Article

Headwinds Slow 2019 Vegas Business, Lab-grown Diamonds Proliferate

Russell Shor, June 14, 2019

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

Looking down the crystal axis of a backlit 58.83 ct trapiche emerald

Article

Emerald: The Superstar of Trapiche Gemstones

Sharon Bohannon, May 17, 2019

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

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

, May 15, 2019

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

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

, May 15, 2019

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

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

Ziyin Sun, Aaron C. Palke, Christopher M. Breeding, and Barbara L. Dutrow, May 15, 2019

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

Appendix 3: Calculation Method for Tourmaline Species Classification Used Here

, May 15, 2019

Calculation Method for Tourmaline Species Classification Used Here

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

, May 15, 2019

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

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

, May 15, 2019

Simplified Tourmaline Species Classification for LA-ICP-MS Data

This Month's

Featured Gems

Peridot

Found in lava, meteorites, and deep in the earth’s mantle, yellow-green peridot is the extreme gem.

Fancy Color Diamond

Dazzling brilliance. Captivating color. These are the planet’s most valued gems.

Diamond

Diamonds are among nature’s most precious and beautiful creations.

Emerald

Emerald is the bluish green to green variety of beryl, a mineral species that includes aquamarine.

Citrine

Citrine is the transparent, pale yellow to brownish orange variety of quartz.

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Tourmaline

Research

Reviewed

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Gemstones

Gemstones

Featured Gems

Peridot

Fancy Color Diamond

Diamond

Emerald

Citrine

Tourmaline

Research

Reviewed

Topics

Topics

Gemstones

Gemstones

Featured Gems

Peridot

Fancy Color Diamond

Diamond

Emerald

Citrine

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