A rhodochrosite on display at AGTA dates back more than a century to Colorado’s Alma Mining District.

Examination of a 0.40 ct near-colorless round brilliant diamond with a large inclusion resembling a dumbbell

A useful way to identify stones that contain no distinguishing inclusions.

The February 2012 discovery of high-quality blue sapphires at Thammannawa near Kataragama in southeastern Sri Lanka has intensified gem mining and exploration in the surrounding area and all over the country.

Examines the sources, color, texture, and chemical composition of jadeite from Japanese deposits.

Dave Bindra shows some noteworthy pieces he obtained on the secondary market and shares his thoughts on the state of the colored stones market.

Alexander Arnoldi explains the strategy of Arnoldi International and provides an update on some new high-quality materials.

An overview of the 2018 Tucson gem shows.

New developments relating to the Winter 2016 article on synthetic emeralds grown by Prof. Richard Nacken.

“Rainbow” andradite from Nara, Japan, occurs as relatively small orangy brown crystals that show attractive iridescence in almost the entire range of the spectrum.

An unusual mite is preserved in a 30-million-year old amber specimen.

Renowned designer Paula Crevoshay discusses artistic influences and her latest creations.

Freshwater pearls are the subject of GIA’s latest research involving the DNA barcoding and next-generation sequencing of biogenic materials.

An overview of the Summer 2024 Gems & Gemology content.

Examination of an Oregon sunstone sample reveals pyritic and copper inclusions.

Provides an overview of processes for synthesizing gem materials and explains how unique growth conditions enable them to be separated from naturally formed gems.

Elongated zircon inclusions display attractive birefringent interference colors in a blue sapphire from Kashmir.

A large baroque-shaped blister pearl with a unique multicolored appearance is examined in the Mumbai laboratory.

An intriguing inclusion scene is analyzed in a Paraíba tourmaline from Brazil.