External Morphology and Internal Zonal Structure of Macle Diamond
Investigates the morphological changes of macle diamonds during the growth process by exploring their three-dimensional internal zonal structure.
Fingerprint Pattern on a “Hammered” Pearl’s Surface
Spiral patterns of nacre platelets observed on the surface of a non-bead cultured pearl are reminiscent of fingerprints.
Blooming Bouquet: Thin Films in Russian Emerald
Colorful thin film inclusions are captured within a Russian emerald carving.
“Bamboo Forest” in Colombian Emerald
Dense tube inclusions in emerald create a scene reminiscent of a tranquil bamboo forest.
An Unconventional Bead Cultured Saltwater Pearl
A semi-baroque saltwater nacreous pearl presents identification challenges in the Mumbai laboratory.
A Rare Friedelite
The Carlsbad laboratory reports on a rare submission of orangy red translucent friedelite.
Fracture-Filled Diamonds Detected in Mounted Jewelry
The Mumbai laboratory reports on a jewelry submission containing fracture-filled diamonds.
100 ct Cuprite with Malachite Inclusions
A large faceted cuprite is examined at the Carlsbad laboratory.
Assembled Black Imitation Pearl
An undrilled black bead is identified as an assembled imitation pearl made from shell fragments.
2026 Sinkankas Symposium: Gems and Minerals of Burma (Myanmar)
The date and topic of the 2026 Sinkankas Symposium is announced.
Fuchsite-Bearing Dolomite Aggregate as a New Jadeite Imitation
A snuff bottle submitted to TULAB as jadeite jade is identified as a dolomite aggregate with fuchsite.
New Edition of Tillander’s Diamond Cuts in Historic Jewellery 1381–1910
An updated edition of Herbert Tillander’s book is now available.
Susan Jacques Receives Richard T. Liddicoat Award for Distinguished Achievement
GIA’s president and CEO Susan Jacques is honored with the Richard T. Liddicoat Award for Distinguished Achievement.
Al Gilbertson Receives Robert M. Shipley Award
GIA’s Al Gilbertson receives the American Gem Society’s highest honor.
Characterization of “Orange Peel” Surface Microstructure of White Nephrite from Russia: A Unique Pseudomorph Pattern
Examines correlations between surface microstructures and the orange peel effect in Russian white nephrite, proposing a formation model and revealing distinctive microfeatures specific to the material.
Converge 2025 GIA Hands-On Sessions
GIA offered a variety of hands-on sessions for attendees during the Converge conference.
Two Assembled Pearls
Natural pearl cores are used to simulate the appearance of natural pearl growth in two assembled pearls mounted in a pair of earrings.
Starburst Cloud Inclusions in Diamond
Clusters of micro-inclusions form starburst-patterned clouds in a 2.50 ct Faint yellow-green round brilliant diamond.
Quench-Crackled and Dyed Laboratory-Grown Sapphire
The Carlsbad lab receives a laboratory-grown colorless sapphire with weblike fractures containing concentrations of dye.
Prismatic Bicolor Dumortierite Crystal
A 63.17 ct dumortierite rough crystal is examined in the Bangkok laboratory.
.jpg "YMAL GIA Ed")
