SSEF Trade Alert: Fraudulent filling of fissures in emeralds after they have been laboratory...
TRADE ALERTSSEF - the Swiss Gemmological Institute
Based on a number of recent cases, the Swiss Gemmological Institute SSEF is issuing a trade alert concerning...
GIA and the Science of Origin Determination: The Research Behind the Report
AGTA's DYNAMIC Seminar with Dr. James Shigley, Dr. Aaron Palke, and Wim VertriestGIA's Team Discusses What it Takes to offer a Country of Origin...
Too Much Chromium? When Red Gems Stop Glowing
For generations, gemologists and jewelers have been taught a simple rule: chromium makes red gems beautiful. It is the element behind the glow of...
In Memoriam: George Peter “Pete” Yantzer
George Peter “Pete” YantzerNovember 10, 1948 - January 10, 2026
George Peter “Pete” Yantzer, a respected gemologist and influential figure in modern diamond grading, passed...
GIA to Update Colored Gemstone Reports: More Country-of-Origin Gems on the List
GIA, the Gemological Institute of America, will launch redesigned colored stone reports and new services on January 1, 2026. The new reports will feature...
Into the Stone: Photomicrography from E. Billie Hughes
"One of the beauties of working with gemstones is that each time you peer into a stone, you get a glimpse of the universe...
Into the Stone: Photomicrography from E. Billie Hughes
Here we have a close-up of a "fingerprint" inclusion in a Madagascar sapphire, shown before-and-after heat treatment. In this paired photomicrograph series by E....
Holiday 24-Hour Diamond Services at GIA’s Gem Lab
This holiday season, GIA is again offering complimentary next-day Diamond Grading Report and GIA Diamond Dossier® services for submissions to the New York and...
Big Bicolor: GIA Studies Rare 37-Carat Pink-and-Colorless Rough Diamond
...and you thought you were under a lot of stress.
GABORONE, BOTSWANA – The GIA laboratory in Botswana recently examined an extraordinary 37.41-carat pink-and-colorless rough...
LMHC Agrees on Colour Stability Testing, “Cobalt Spinel,” Tanzanite, as well as “Fei Cui”
Getting seven of the world's leading gem labs to agree on anything is no small task. Yet for nearly 25 years, the Laboratory Manual...
GIA Examines Motswedi: World’s 2nd Largest Gem Quality Rough Diamond Crystal
The Gemological Institute of America (GIA) has announced that their research team in Gaborone, Botswana – joined by Tom Moses, GIA Executive Vice President...
“Lab-Grown” is Out, “Synthetic” is Back In: GIT Aligns with CIBJO – and France
Starting October 1, 2025, GIT–the Gem and Jewelry Institute of Thailand's gem testing laboratory–will be updating the way it words its reports to better...
