西袖加速器
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.
Read More
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.
Learn More
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.
Read More
G&G Announces Most Valuable Article Awards
G&G announces the winners of the Dr. Edward J. Gübelin Most Valuable Article Awards for 2025.
手机怎么搭梯子到外网
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.
Read More
Tucson 2025 Overview
An overview from the 2025 Tucson gem shows.
Read More
西袖加速器
谷歌搭梯子教程
Engagement Rings
Start A Career
in Gems & Jewelry
手机谷歌怎么挂梯子教程
Verify a Stone
Download
Gems & Gemology
西袖加速器
Peridot
Found in lava, meteorites, and deep in the earth’s mantle, yellow-green peridot is the extreme gem.
谷歌搭梯子教程
Dazzling brilliance. Captivating color. These are the planet’s most valued gems.
Diamond
Diamonds are among nature’s most precious and beautiful creations.
Emerald
Emerald is the bluish green to green variety of beryl, a mineral species that includes aquamarine.
Citrine
2021手机可用翻墙梯子
Citrine is the transparent, pale yellow to brownish orange variety of quartz.
