Research & News
New Blue Sapphire from Rakwana, Sri Lanka
An exciting find reveals a pocket of exceptionally large and lustrous royal blue sapphire crystals in a town already known for these beautiful gems.
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.
Diamonds Are Not Forever! Diamond Dissolution
Violent kimberlite eruptions impact the surface features of diamonds, which can give scientists useful information about how diamonds react with the fluids in the mantle.
“Electronic Device” in an Atypical Bead Cultured Pearl
GIA’s Hong Kong laboratory looks at a new radio-frequency identification (RFID) technology for tracking cultured pearls.
Large and Fine Demantoid from Russia
Unusually large top-quality faceted Russian demantoid garnets were exhibited at the Tucson GJX show.
Fluorescence Spectroscopy for Colored Pearl Treatment Screening
A nondestructive rapid screening technique uses fluorescence spectroscopy to identify treated colored pearls.