2023 Sinkankas Symposium
The Nineteenth Annual Sinkankas symposium, held at GIA’s Carlsbad, California campus, focused on gems and minerals of San Diego County.
Susan Jacques Receives Robert M. Shipley Award
GIA president and CEO Susan Jacques receives the American Gem Society’s highest honor.
A New Treatment: Creating Phantom Structure in Opal
A newly developed treatment creates a phantom structure in opal visually similar to natural phantom opal.
Spring 2023 Auction Highlights
After a slow start, the spring 2023 auction season ends with multiple broken records.
Characteristics of Treated Rubies from Greenland
Gemmes
Swiss-based Gemmologie & Francophonie launches a new French-language digital publication.
Special Hair-Like Inclusions in Quartz
A close look at inclusions in a variety of “rabbit hair” quartz samples.
Sustainability Conference at JCK
GIA participates in two sustainability panels during the 2023 JCK Las Vegas show.
Unique Colombian Emerald and Matrix Suite
A look at a unique matching set of emerald and brown matrix cabochons from the Muzo mine in Colombia.
Calcite Present in a Pearl from Pinctada maculata
Examination of a Pinctada maculata pearl reveals an interesting columnar calcite surface structure.
Saltwater Clamshell Beads (Tridacna Species) Used in Freshwater Cultured Pearls
A report from GIA’s Bangkok laboratory on freshwater bead cultured pearls with saltwater bead nuclei.