Irradiated CVD-grown diamonds are examined in the Carlsbad lab.

For the first time, wurtzite is found as an inclusion in gem material.

Projects developed by the GemHub to benefit miners, cutters, and others involved in the gem and jewelry industry.

Gold: Vortex, Virtues, and Values was hosted by Initiatives in Art and Culture (IAC) at Bohemian National Hall in New York City, April 12–13. Now in its eighth year, the conference has become an annual industry gathering for those looking to evaluate the market, discover exceptional work, and discuss key gold-related issues.

The DiamondView instrument is able to identify glass as the filler in a pair of heart-shaped rubies.

An unusual assembled stone is examined at GIA’s New York lab.

Aesthetically pleasing inclusions are found in topaz from Pakistan’s Shigar Valley.

Lotus Gemology receives submissions of star stones on a regular basis, so when we first saw the specimen shown here, it appeared to be one among many of our usual stones to test.

A black star sapphire produced from eastern Thailand, showing both golden and silver rays, is studied at GIA’s Bangkok lab.

The first known group of color-change gem-quality chrome grossular garnet, reportedly from Ethiopia, is examined in GIA’s Carlsbad lab.

Rare pearls, along with their shell, are studied in the Hong Kong lab.

Summarizes data collected on more than 15,000 natural blue/gray/violet diamonds examined by GIA during the last decade and examines the mechanisms that produce this color range.

Presents a visual guide to the growth processes and major gemological spectroscopic features of synthetic diamonds.

Characterizes a suite of 40 natural brown to black diamonds from this deposit so that they can be distinguished from suspected treated black diamonds.

Examines Japanese “Kasumiga” freshwater cultured pearls, which grow in a variety of colors.

Summarizes data collected on more than 15,000 natural blue/gray/violet diamonds examined by GIA during the last decade and examines the mechanisms that produce this color range.

The first installment of G&G’s newest section explores how natural diamonds shed light on the mystery of water found in Earth’s deep mantle.