News & Articles

Extraordinary Large Bicolor Natural Rough Diamond

Sally Eaton-Magaña, Kgotlaetsho Baatshwana, and Norma-Jean Osi, October 15, 2025

A 37.41 ct natural rough diamond with distinct pink and colorless zones is examined at GIA’s Botswana laboratory.

How GIA Analyzes Pearls from Start to Finish

Phoebe Shang, October 13, 2025

How GIA Analyzes Colored Stones from Start to Finish

Phoebe Shang, September 30, 2025

Summer 2025 G&G Available Now

Erica Zaidman, August 29, 2025

An overview of the Summer 2025 Gems & Gemology content.

How-To Guide: Testing Diamonds and Gems using UV Light

Phoebe Shang, August 20, 2025

GIA Tests the World’s Second Largest Diamond

Tom Moses and Wuyi Wang, August 15, 2025

Summer 2025 Issue