A new nacre scale is established in the GIA 7 Pearl Value Factors classification system.

Pinpoints densely cover the surface of a golden South Sea pearl.

Grossular crystals cut along specific orientations reveal a distinct trapiche structure.

Two natural diamonds exhibiting dark micro-inclusions are compared in the Carlsbad laboratory.

An overview of the Summer 2025 Gems & Gemology content.

Profiles the extraordinary life and work of Ben Kho, from a young entrepreneur in Cambodia to an award-winning gem cutter.

A report from GIA’s Carlsbad laboratory on emerald and beryl samples studied as part of an ongoing beryl characterization research project.

Describes the geology, mineralogy, and formation of granitic-composition pegmatites and provides a summary of their worldwide occurrences.

Provides a comprehensive summary of the special optical effects in gemstones, including opalescence, chatoyancy, asterism, schiller, and iridescence, and investigates the submicron inclusions and nanotextures in each type of phenomenal stone.

An overview of the Summer 2025 Gems & Gemology content.

In July 2025, staff from GIA, including GIA Executive Vice President and Chief Research and Laboratory Officer Tom Moses and Vice President of Research and Development Dr. Wuyi Wang, examined a rough diamond weighing 2,488.32 carats

In July 2025, staff from GIA, including GIA Executive Vice President and Chief Research and Laboratory Officer Tom Moses and Vice President of Research and Development Dr. Wuyi Wang, examined a rough diamond weighing 2,488.32 carats

GIA will launch revised evaluation services for D-to-Z laboratory-grown diamonds on October 1

GIA will launch revised evaluation services for D-to-Z laboratory-grown diamonds on October 1

Sriram 'Ram' Natarajan, previously managing director of GIA India Laboratory Private Limited (GIA India), has been appointed to a new role as senior vice president of laboratory operations.

GIA developed this guide so retailers can use fluorescence tests to help identify gems right in their own stores.

Industry leaders and some of GIA’s most experienced gemological experts will share their expertise and insights with participants at Converge

Industry leaders and some of GIA’s most experienced gemological experts will share their expertise and insights with participants at Converge.

360-degree video of the Motswedi diamond.