Research & News
Phenomenon Resembling Play-of-Color in Sapphire
Subtle tilting of the unheated sapphire revealed a noteworthy phenomenon resembling play-of-color, which is most commonly seen in precious opal.
GIA Knowledge Sessions
Engage in webinars on the most diverse and pressing issues in gemology today, including gemstone origin, laboratory-grown stones and new discoveries in field gemology.
k频道网址入口kpd5com,k频道安装包下载Formation of the “Matryoshka” Diamond from Siberia
A freely moving diamond crystal completely enclosed in a diamond from Siberia gets its name from the famous Russian nesting dolls.
G&Gk频道网址入口kpd5com,k频道安装包下载 Announces Most Valuable Article Awards
G&G announces the winners of the Dr. Edward J. Gübelin Most Valuable Article Awards for 2019.
A Pin for Coronavirus Health Care Fighters
GIA graduate Franco Valobra creates a commemorative pin to recognize health care workers on the frontline of the coronavirus battle for survival.
Tucson 2020 Overview
An overview from the 2020 Tucson gem shows.