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

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

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

A new mining operation in Montepuez is profiled.

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

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

A color change in rough garnet is observed and plotted in GIA’s Carlsbad lab.

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

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

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

Considers the previously unreported but critical impact of silicon on the coloration of gem-quality sapphire.

ペンリン島で採取された4つのミドリアオリ養殖ブリスター パールに関する研究。