Trapiche Tourmaline from Zambia
Well-formed crystals of green tourmaline from northwestern Zambia show a growth pattern reminiscent of trapiche emerald/ruby when sliced perpendicular to the c-axis.
An Era of Sweeping Change in Diamond and Colored Stone Production Markets
The diamond, colored stone, and pearl businesses have witnessed unprecedented change since the turn of the 21st century.
New Technologies and Techniques
Diamond Identification
General Gemology and Jewelry
General Gemology and Jewelry
Gem Localities and Formation
Colored Stones and Pearls
Diamond Identification
Gem Characterization
Quarterly Crystal: Molybdenite Phantoms in Quartz
Raman analysis identifies unusual inclusions in quartz.
Futurescape Forum
A recap of the Futurescape Forum panel from GIA’s 2018 International Gemological Symposium.
Diamond Geology
Gem Localities and Formation
New Technologies and Techniques
Detection of Treatment in Two Unusual Green Diamonds
Natural-Color Purple Diamonds from Siberia
Twelve natural-color purple diamond crystals from Siberia were studied using spectroscopic methods to better understand their color and its causes.
A History of Diamond Treatments
Emeralds from the Fazenda Bonfim Region, Rio Grande do Norte, Brazil
In 2006, emeralds were discovered in the Fazenda Bonfim region of northeastern Brazil.
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