A diamond is proven to have a superdeep origin through an inclusion of CaSiO3-walstromite.

A bangle is an example of the misconception that B jade is only impregnated by resin, when in fact wax-impregnated jadeite is also considered B-jade.

The Antwerp lab examines CVD laboratory-grown diamonds where HPHT processing resulted in relatively low color grades.

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.

Synthesized gem-quality diamonds from the General Electric Company are analyzed for characteristics that distinguish them from natural stones.

This article reports on a detailed gemological examination of this new synthetic cat's-eye alexandrite.

A find of new gem garnets has been made in contact metamorphic deposits in the Republic of Mali, western Africa.

Observations made at GIA on 858 GE-processed diamonds revealed several interesting features that may be diagnostic of this kind of diamond. Specifically, a significant percentage exhibited a slightly hazy appearance, noticeable internal graining, and other unusual internal features.

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.

This document provides access to the 2014 G&G Challenge.

This document provides the publication information for Gems & Gemology

This document provides the publication information for Gems & Gemology

This document provides the publication information for Gems & Gemology

Trigonal cinnabar inclusions are identified in a crystal cluster of fluorite and calcite.

Some manufacturers are known to have treated Verneuil flame-fusion synthetic rubies by immersion in a flux melt to induce patterns like the “fingerprints” seen in some natural rubies.