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This Month's
The Latest in Field Gemology from Wim Vertriest
Learn the latest on Madagascar sapphires and demantoid garnets from Wim Vertriest, GIA Manager of Field Gemology.
Mineralogy and Geochemistry of Turquoise from Tianhu East, Xinjiang, China
Examines turquoise from northern China and identifies a geographic origin indicator to distinguish it from other Chinese sources.
Cloud Inclusions Causing Fancy Light Blue Color in Diamond
The New York laboratory reports on the cause of color in a Fancy Light grayish blue diamond.
Rainbow Rays in Rainbow Lattice Sunstone
Colorful rays of light are observed in an Australian rainbow lattice sunstone.
The Lengthy Vertical Journey of Superdeep Diamonds
Explores the journey of superdeep diamonds to the earth’s surface.
Beyond Beauty: A Garnet Necklace Decoded
A platinum necklace featuring 28 rare garnets won two 2023 AGTA Spectrum Awards.