Extremely Rare Hellandite Inclusion Found in a Mogok Ruby
A rare inclusion is reported in ruby from the Mogok mine for the first time.
Fall 2022 Auction Highlights
A successful spring season set high expectations for colored diamonds at auction in late 2022.
Grossular with Strong Red Fluorescence
A detailed fluorescence analysis of pink grossular is documented for the first time.
GSA 2022 Annual Meeting
An overview of GIA’s presentations at the annual Geological Society of America (GSA) meeting held in Denver, Colorado.
In Memoriam: Peter Keller
The gemological community mourns the loss of former GIA director of education and instrumental G&G contributor, Peter Keller.
Red-Dyed Spodumene Imitating Ruby
Testing identifies a “red corundum” sample as red-dyed spodumene.
Identification of Natural, Reconstructed, and Imitation Root Amber
Three types of root amber beads submitted for identification are analyzed in Wuhan, China.
Quartzite Bangle with Fuchsite Inclusions
A quartzite bangle mimics the appearance of jadeite jade.
Synthetic Rock Crystal Quartz Cluster with Natural-Looking Inclusions
A synthetic quartz crystal cluster is easily mistaken as a natural specimen.