Research & News
Testing reveals the source of a fiber trapped in an emerald during the enhancement process.
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.
Testing of a Mogok spinel demonstrates that oil can have a significant impact on clarity.
Magnetite Inclusions in Star Peridot
Magnetite inclusions in a four-rayed star peridot help to date its terrestrial age.
Tree in Rock Crystal Quartz
An unusual find of orangy red staurolite crystals appear with more expected inclusions in a ruby from Mozambique.
Novelty Cut Diamond with Remarkable “Fire and Ice” Fluorescence
Dramatic color-fluorescing areas in a sword-shaped diamond give rise to the nickname “Fire and Ice.”