New Gems & Gemology Issue
Blue Fluorescence in Diamonds, “Edison” Treated Pearls, and Pakistan’s Main Gem MarketREAD MORE
Research & News
CVD Laboratory-Grown Diamond with Counterfeit GIA Inscription
A CVD laboratory-grown diamond with a fraudulent GIA inscription is submitted to the Antwerp lab.
GIA Knowledge Sessions
Engage in webinars on the most diverse and pressing issues in gemmology today, including gemstone origin, laboratory-grown stones and new discoveries in field gemmology.
Hole Drilled by Hand in Briolette
A centuries-old diamond featuring a hand-drilled hole inspires an investigation of the briolette cutting style and the history of drilling diamonds.
Rare Faceted Hexagonite
The Carlsbad laboratory recently examined an unusually large faceted hexagonite with iridescent cleavage cracks and needle-like structures.
Unusual Fluorescence of a Color-Enhanced Amber Bracelet
Abnormal fluorescence supports the likelihood that this amber bracelet had been “baked” to enhance its color.
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.