Diffusion-Induced Blue Spinel-Like Layer on Natural Sapphire
Three natural sapphires exhibiting a surface layer of gahnite are studied at the GGTL laboratory.
Gold-Plated Gold
The application of plating is detected on gold jewelry pieces in the Carlsbad laboratory.
Freshwater Pearls vs. Saltwater Pearls: Understanding the Difference
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Two Pearls of Indian Cultural Significance
Two pearls representing Indian deities were recently examined in the Mumbai laboratory.
Ancient Script-Like Serpentine in Brown Peridot
Examination of a brown peridot xenocryst reveals thread-like serpentine inclusions resembling ancient text.
Identification of Natural, Reconstructed, and Imitation Root Amber
Three types of root amber beads submitted for identification are analyzed in Wuhan, China.
A “Cobalt Blue” Gahnospinel
Cobalt is identified as the primary coloring agent in an intense blue specimen of gahnospinel at GIA’s Bangkok laboratory.
Large Faceted Pallasitic Peridot
A large specimen of extraterrestrial peridot is analyzed at the Carlsbad laboratory.
“Fishbone” Inclusion in a Burmese Peridot from Mogok
Examination of Burmese peridot with impressive size, color, and clarity reveals a fishbone-shaped inclusion.
Gems & Gemology Turns 90!
Aegirine in Poudretteite
Aegirine inclusions are observed in two samples of poudretteite from Mogok.
G&G Contributors Awarded for Best Geoscience Research
Several G&G contributors are recognized for their work on the latest volume in the Reviews in Mineralogy & Geochemistry series.
The Distinction of Natural from Synthetic Alexandrite by Infrared Spectroscopy
A useful way to identify stones that contain no distinguishing inclusions.
Spray of Columbite Crystals in Topaz
A cluster of bladed columbite crystals is identified in colorless topaz.
Turquoise Planet Earth
A sphere of Armenian turquoise with natural brown matrix material mimics planet Earth.
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