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Research & News
Feature
Gems on Canvas
Explores the use of gem materials as pigments in works of art, from the earliest cave paintings to the modern era.
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Webinar Series
GIA Knowledge Sessions
Engage in webinars on the most diverse and pressing issues in gemology today, including gemstone origin, laboratory-grown stones and new discoveries in field gemology.
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Micro-World
Chondrodite in Red Spinel from Mogok, Myanmar
The Bangkok lab recently encountered a single round crystal of chondrodite in red spinel, a possible indicator of Burmese origin.
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Lab Notes
Two Antique Mughal Spectacles with Gemstone Lenses
Unique diamond and emerald-lensed spectacles from the Mughal Empire were tested in GIA’s New York laboratory.
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Colored Stones Unearthed
Colored Stones from the Deep
The first installment of this column discusses the formation of colored stones from the crust-mantle transition and below.
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Micro-World
Radioactive Green Diamond
The Carlsbad lab recently encountered a 2.42 ct green diamond showing signs of radiation treatment by the use of radioactive salts.
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