Chatoyancy, rarely seen in play-of-color opal, is observed in Ethiopian material.

Quality assurance testing in the Bangkok lab reveals HPHT synthetic melee in larger sizes.

A sapphire with a color not commonly seen in the lab is found to have a glass filling.

GIA examines a multi-elemental diffused and melt-grown synthetic sapphire for the first time.

A topaz hosting a group of inclusions is examined in the Carlsbad lab.

Imitation pearls show kaleidoscopic colors with illumination.

A new mining operation in Montepuez is profiled.

An exclusive interview with Ian Harebottle, CEO of Gemfields.

Recounts the history, geology, and notable localities of diamond mining in Brazil, and outlines plans for future diamond production.

The recession of 2008 transforms a gem business into a vertically integrated operation.

An overview of the trends reported at the 2017 Tucson gem shows.

Investigates the properties of synthetic zincite produced by industrial kilns in Poland.

An overview of the Spring 2017 Gems & Gemology content.

An experienced gem dealer gives an overview of sourcing gem-quality Afghan emeralds.

A look at top-quality gems and insight into a delegation’s visit to gem mines in Myanmar.

Paintings created from uncut gem fragments are seen at Tucson’s GJX show.

An eye-catching replica from a cult TV favorite is found in Tucson.

Plastic Amber Imitation in a Rosary | Gems & Gemology

Optical activity is studied using a polished block of ametrine.

Identifies 13 copper-bearing tourmalines, which have traditionally been assumed to be elbaite species, as liddicoatite.