Heat Treatment of Burmese Ruby, Copper-Diffused Red Feldspar, and Porcelain-Treated Turquoise
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Research & News
Low Temperature Heat Treatment of Burmese Ruby
Documents heating experiments conducted on Burmese rubies to find useful indicators of heat treatment at temperatures below 1200°C.
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.
An Extraordinarily Large Cat’s-Eye Emerald
The Tokyo laboratory examines a 126 ct cat’s-eye emerald from Brazil.
Unusual “Horsetail” and Columnar Inclusions in Demantoid
Examination of a yellowish green demantoid reveals fibers of serpentine in a randomly curved pattern and a columnar two-phase negative crystal.
Gems Formed in Magmatic Rocks
This installment of “Colored Stones Unearthed” covers gemstones that formed in magmatic environments and the insights they offer into the evolution of the earth and the geological processes that shaped our world.
GSA 2022 Annual Meeting
An overview of GIA’s presentations at the annual Geological Society of America (GSA) meeting held in Denver, Colorado.