Lovely rose-pink natrolite from Indonesia is dubbed “rhodatrolite” for its color and texture.

Many variables were involved in the sale and manufacture of a beautiful rough gem during difficult times.

An overview of the Summer 2024 Gems & Gemology content.

GIA’s Mumbai laboratory reports on the study of Pteria sterna shells with visible protuberances.

Bluish green and white spheres create a beautiful inclusion scene in quartz from Larimer County, Colorado.

A Tridacninae pearl exhibits a flame structure resembling an eye.

A dark crystal and a stress cleavage crack resemble a quarter note in a diamond.

While different types of inclusions often occur independently within diamond, it is quite rare to find more than one occurring simultaneously, let alone in contact with each other.

The Tokyo laboratory reports on a submitted stone composed of both chrysoberyl and alexandrite.

A nacreous-looking calcite pearl exhibiting red X-ray fluorescence is documented for the first time at GIA.

Testing of five CVD laboratory-grown diamonds submitted to the New York laboratory reveals post-growth treatment to achieve fancy colors.

A large shell submitted to the Mumbai laboratory exhibits both a blister pearl and a shell blister.

Examination of an akoya keshi pearl in the Mumbai laboratory reveals rare seed features and an acicular structure.

A three-phase fluid inclusion containing graphite is observed in a Sri Lakan sapphire.

Swiss-based Gemmologie & Francophonie launches a new French-language digital publication.

A close look at inclusions in a variety of “rabbit hair” quartz samples.

GIA participates in two sustainability panels during the 2023 JCK Las Vegas show.

A look at a unique matching set of emerald and brown matrix cabochons from the Muzo mine in Colombia.

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