Research & News
Tucson 2020 Overview
An overview from the 2020 Tucson gem shows.
GIA Knowledge Sessions
Engage in webinars on the most diverse and pressing issues in gemmology today, including gemstone origin, laboratory-grown stones and new discoveries in field gemmology.
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.
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.
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.
Carvings from Bali
Balinese carvers using traditional methods create striking pieces from Australian opal as well as unusual materials such as mammoth tusk and bovine bone.