A “Hollow” Pearl Filled with Foreign Materials
Conclusively identifying the origin of a “hollow” pearl filled with foreign materials proves challenging.
Rough Diamond Crystal with an Unusual Coating of Fake Green “Radiation Stains”
The interior structures of pearls are always of interest, as they are never revealed until the analysis begins.
Color-Change Spessartine Garnet: A First Report
The Carlsbad laboratory encounters a unique spessartine garnet that displays a strong color change from dark green to dark red.
Dyed Serpentine Imitating Sugilite
Advanced testing confirms dyed material as serpentine, rather than the sugilite it was meant to imitate.
Faceted Milarite
A light yellow 2.07 ct oval brilliant is the first faceted milarite examined by the Carlsbad laboratory.
Exsolved Particles with Natural Appearance Within Flux-Grown Pink Synthetic Sapphire
Flux-grown pink synthetic sapphire displays a natural-looking inclusion scene.
Resin-Coated and Clarity-Enhanced Aquamarine Pendant
Careful examination by the Carlsbad laboratory identifies both coating and clarity enhancement of an aquamarine pendant.
Separation of Kornerupine and Prismatine
GIA’s laboratories are now using LA-ICP-MS to separate kornerupine from prismatine based on boron concentrations.
Spurrite
Recently, the Carlsbad laboratory identified a 19.68 ct gray-purple spurrite with the help of advanced testing.
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