In Memoriam: Professor Mimi Ou Yang (1933–2026)
The international gemological community has lost one of its great educators, researchers, and pioneers with the passing of Professor Mimi Ou Yang Chiu Mei,...
A Munsteiner Cut – Unheated Tanzanite
Philipp Munsteiner - Unheated Tanzanite - Munsteiner Cut
This magnificent gem weighs 122.50 carats.
The original weight of the rough was 75 grams (375 carats).
Philipp spent...
Sotheby’s New York Fine Watches Auction — A Quick Peek
The mid-June New York Fine Watches auction at Sotheby's featured several gem-set timepieces that caught our attention, from a demantoid-encrusted brooch watch, an ultra-thin...
GIA Commemorates the 250th – Celebrate the 250th Anniversary of the United States of...
Red, White, and Blue
from GIA - Carlsbad, CA
Red, white, and blue may be familiar colors, but the gems that display them are anything but...
India is Still Looking for Diamonds – and Found 5! (Don’t get too excited)
Two hundred tonnes of rock and sediment. Five rough diamonds. Just 1.22 carats.
5, but really only 2This was the result of recent bulk-sample testing...
AGTA’s 2026 Spectrum and Cutting Edge Awards
Now Open for Entries!
Here is your official invitation, "to enter one of the most prestigious jewelry design competitions in the world."
The AGTA Spectrum &...
When Price Becomes Secondary to Availability: Why GemGuide Changed the Way it Prices Burmese...
For decades, gemstone pricing guides have operated on a simple assumption... If enough material exists in the marketplace, researchers can observe transactions, compare qualities,...
Does the Emerald Still Match the Report? – SSEF Issues Trade Alert
TRADE ALERTSSEF - the Swiss Gemmological Laboratory
SSEF Issues Trade Alert After Identifying Re-Filled EmeraldsAccompanied by Earlier "No or Minor Enhancement" Reports
Picture this:
An emerald with...
GCAL Expands 8X Grading to Cushion Cuts: How Much Precision is Enough — and...
For decades, diamond grading reports have documented a stone's color, clarity, carat weight, and proportions. Yet anyone who has spent time comparing diamonds knows...
“Colors of the Diamond Market” – 2026 AGA Virtual Conference: This Tuesday, June 23,...
The Accredited Gemologists Association (AGA) hosts a dedicated virtual event focused on the diamond market and gemology.
The conference—"Colors of the Diamond Market"—provides insights into...
Into the Stone: Photomicrography from E. Billie Hughes
This time, Billie Hughes gives us something rarely seen: a before-and-after-and-after-again look at what happens to an inclusion during heat treatment.
As gemologists, we are...
Chicago Responsible Jewelry Conference
Connect with industry leaders and attend the Responsible Gem Boutique and the Chicago Responsible Jewelry Conference, taking place October 22–24, 2026.
Enjoy shopping at the...
