Research & News
Inclusions in Kenyan Rubies from the John Saul Mine
Very similar inclusion scenes featuring needles and thin films make rubies from Kenya hard to distinguish from Mogok rubies.
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.
Study of Rare Diamonds Unlocks More of Earth's Secrets
Scientists at GIA continue to delve deep into earth's geologic history, using diamonds' distinctive characteristics to go – virtually – where no scientist has ever gone.
Unknown Dendritic Inclusions in Sapphire
Dendritic inclusions in a pinkish-purple sapphire are revealed with fiber-optic lighting.
A Near-Field-Communication (NFC) Technology Device Embedded in Bead Cultured Pearls
A Tahitian pearl becomes wearable technology with the insertion of a micro device.
Blue “Graining” in Green-Yellow Diamond
Unusual color zoning likely indicates multiple treatments of a Fancy Intense green-yellow diamond.