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Research & News
Micro-world
Yellow Fluid Inclusions in Transparent Sodalite
A rare transparent and near-colorless sodalite contains two-phase inclusions linking it to its ancient formation.
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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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Lab Notes
Chrysoberyl Inclusions in Flux-Grown Ruby
Natural-looking chrysoberyl crystals appear in a flux-grown ruby with a high beryllium content but lacking heat treatment.
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Gem News International
Calcareous Coral and Epoxy Composite
Meticulous testing of a bangle submitted to a Taiwan gemology lab proves it to be a composite of red calcareous coral and epoxy.
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Micro-world
Bent Rutile in Rock Crystal Quartz
Normally straight and fine, rutile needles take an unexpected bend in the polished quartz disk that is their host.
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Gem News International
Agate Inclusion in Quartz from Brazil
Agate appears as an interesting inclusion in a pair of faceted quartzes.
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