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

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

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

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

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

A family sources, designs, and carves gems for extraordinary jewelry and pieces.

Sapphires from Baw Mar host multiphase inclusions in appealing patterns.

A look at the 2016 sapphire production from Montana’s Rock Creek deposit.

Plans to develop a collective in a remote Brazilian rutilated quartz mining community are unveiled.

A report from the second Jewelry Industry Summit, held in Tucson, Arizona on January 29–30, 2017.

Insight into amethyst mining activity in Morocco.

World-renowned jewelry artist Paula Crevoshay displays some of her newest pieces at the Tucson gem shows.

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

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

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 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.