Research & News
Dramatic Color Zoning in Alexandrite
A gem cutter’s thoughtful design enhances the natural color zoning in an 8.55 ct alexandrite.
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.
Blue Inclusion in Rock Crystal Quartz
A beautiful blue inclusion is highlighted in rock crystal quartz cut to showcase it.
Unusual Violet Maxixe Beryl
A handsome fantasy-cut gem of an unusual violet hue is confirmed as maxixe beryl.
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.”
Trapiche-Type Emeralds from Pakistan
An emerald from the Swat Valley manifests its growth in three distinct steps, identifying it as “trapiche-type."