Two new deposits of Cu-bearing tourmaline have been found in Paraíba State, Brazil, not far from the original source at Mina da Batalha.

Primary and secondary deposits in the Tan Huong–Truc Lau area of northern Vietnam’s Yen Bai Province have supplied rubies and some sapphires for more than a decade.

Since 2002, tsavorite and other grossular varieties have been recovered from a primary deposit at Itrafo, a village in the Andrembesoa area of central Madagascar.

Two-phase inclusions are investigated in alluvial sapphires from deposits in Montana.

Over the last decade, Pakistan has developed into an important source for many gem materials. A number of localities have been identified for emeralds in particular.

Investigating a set of six antique brooches set with diamonds and light blue cabochons.

Gem-quality bright blue to green “Paraíba”-type Cu-bearing tourmaline is now known from deposits in Africa (Nigeria and Mozambique), in addition to three commercial localities in Brazil (in Paraíba and Rio Grande do Norte States).

This article, from the Spring 1994 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.

Over the past 15 years a combination of market forces, environmental events, and scientific research has radically changed the cultured pearl industry.

Evaluates a potential method of visually identifying HPHT-treated diamonds using microscopy to observe intense fluorescence at the facet edges and junctions.

An exploration of the distinction between jadeite and omphacite, plus GIA's current policy concerning the definition of these stones.

Whether you’re starting a new career or taking the next step in your professional journey, a GIA education is considered the pinnacle of training and professional development in gems and jewelry. We teach using the latest research, technology, and time-tested skills, while instilling the importance of professional integrity in our students. A true mark of global distinction, a GIA credential is a symbol of knowledge and trust.

HK Privacy Notice

Information about the GIA Alumni chapters around the world.

GIA’s industry-leading and globally-recognized diploma and certificate programs educate professionals with the skills needed for success in the gem and jewelry industry.

Laboratory-Grown Diamond Seminar/Workshop

Transparent rhodonite is considered one of the most difficult of all gems to facet because of its perfect cleavage and brittle, uneven fracture.

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.

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.