Insight into amethyst mining activity in Morocco.

Exceptional gems that are recirculated in the gem market make an impact at the Tucson shows.

An update on Nigerian colored stone production is obtained at the Tucson gem shows.

Activity at Brazil’s Belmont mine is updated at Tucson.

A report on a new Ethiopian source of high-quality emerald.

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

Imitation pearls show kaleidoscopic colors with illumination.

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.

Describes the occurrence of iridescence, and the role of differential etching, in quartz crystals from India’s Jalgaon District.

A new mining operation in Montepuez is profiled.

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.

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

An exclusive interview with Ian Harebottle, CEO of Gemfields.

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

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.