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Research & News
Lab Notes
Glass Imitation of Star Sapphire
A fixed star indicating manufactured asterism helps to identify an imitation star sapphire.
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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
Quarterly Crystal: Fibers and Rods in Euclase
A well-formed euclase crystal possessed a very rare orange-pink color reminiscent of padparadscha sapphire.
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Gem News International
Pink Aventurine Quartz with Alurgite Inclusions
A “strawberry quartz” bangle is identified as pink aventurine quartz with alurgite inclusions.
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Lab Notes
Laboratory-Grown Diamond with Internal Laser Markings
Accidental laser damage likely caused unusual internal spiral markings in a 2.44 ct CVD-grown diamond.
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Gem News International
Honey Brown and Light Yellow Hydrogrossular
The Gem and Jewelry Institute of Thailand (GIT) identifies two samples as hydrogrossular using advanced testing techniques.
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