Research Article Search Results
Black Nephrite Jade from Guangxi, Southern China
Characterizes black nephrite from a deposit in the Guangxi region that appears to be part of a large-scale jade formation belt in southern China.
Tagua Nut as a Sustainable Botanical Alternative for Ivory
Jewelry designer Alexandra Mor uses sustainable alternatives for elephant ivory.
The Effect of Low-Temperature Heat Treatment on Pink Sapphire
Twelve pink sapphires undergo low-temperature heat treatment and reveal a correlation with the 3232 cm-1 FTIR peak.
A Special Type of Trapiche Quartz
Three incomplete trapiche quartz make up this interesting sample.
Gemological and Chemical Characteristics of Natural Freshwater Pearls from the Mississippi River System
GIA had the unique opportunity to study the gemological and chemical characteristics of 854 natural freshwater pearls from the Mississippi River system.
Gem Art of the Taj Mahal, Fancy White and Black Diamonds, and Unique Inclusions in Thai Corundum
An overview of the Fall 2019 Gems & Gemology content.
Dive Into Summer: Mozambique Ruby, Madagascar Sapphire, and Black Nephrite from China, Plus an Opal Inclusions Chart
An overview of the Summer 2019 Gems & Gemology content.
Euhedral Phantom Sapphire in Sapphire
A phantom sapphire crystal within a host sapphire crystal was recently examined at GIA’s Carlsbad laboratory.
Studies on Tourmaline, Sapphire, Cultured Pearl, and a Reliquary of Legend…
An overview of the Spring 2019 Gems & Gemology content.
Diamonds from the Deep: How Old Are Diamonds? Are They Forever?
The age of something is fundamental. Humans, animals, wine, cars, and antiques are viewed and understood in the context of their age.
Large Faceted Gahnospinel
Advanced testing helps to identify the largest gahnospinel seen at any GIA laboratory.
Chatoyant Quartz/Tourmaline Doublet
A unique doublet displaying a yellowish chatoyant sheen is examined by the Tokyo lab.
