Isolated nitrogen confined to the outer surface of a 0.98 ct diamond causes “yellow skin.”

A feather inclusion with iridescence caused by thin-film interference in diamond resembles an insect wing.

A look at a very rare instance of a six-rayed star in aquamarine.

Various inclusions are observed in a batch of aquamarine samples from Xinjiang, China.

Offers a comprehensive look at a variety of augite from Dong Nai, Vietnam, detailing its formation and gemological characteristics.

Reports on a newly discovered treatment process for producing a deep blue color in natural spinel and proposes identification criteria.

Investigates the mineral and chemical compositions and surface morphology characteristics of brown mammoth ivory to identify the origins of its brown color.

A look at a rare volcanic glass from central Oregon with lapidary artist Tom Dodge.

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Gemstones formed in metamorphic environments offer insights into the earth’s history and the evolution of tectonic activity that led to their formation.

After a slow start, the spring 2023 auction season ends with multiple broken records.

The quality and size of this 4.04 ct CVD-grown diamond ring demonstrate the advancing technology in laboratory-grown diamonds.

GIA, the leading institute for research into diamonds, colored stones and pearls, recently evaluated a diamond ring cut from a single laboratory-grown diamond.

GIA, the leading institute for research into diamonds, colored stones and pearls, recently evaluated a diamond ring cut from a single laboratory-grown diamond.

41 leaders from every global gem and jewelry sector gathered recently for a transformative educational experience at the 2023 GIA Global Leadership Program at Harvard Business School (HBS)

41 leaders from every global gem and jewelry sector gathered recently for a transformative educational experience at the 2023 GIA Global Leadership Program at Harvard Business School (HBS)

“Understanding our impact on the environment, societies and communities in which we operate is integral to our important consumer protection mission,” said GIA President and CEO Susan Jacques, speaking about the launch of the first GIA sustainability report on Friday, June 2, at the JCK Las Vegas show.

“Understanding our impact on the environment, societies and communities in which we operate is integral to our important consumer protection mission,” said GIA President and CEO Susan Jacques, speaking about the launch of the first GIA sustainability report on Friday, June 2, at the JCK Las Vegas show.

The recent successful field-test of an innovative system for mercury-free processing of gold ore is a significant advancement in the important effort to safeguard the health and safety and improve economic outcomes for artisanal, small-scale gold miners (ASGM) and their communities.

Examination of a gem-quality aquamarine crystal reveals an inclusion cluster presumed to be columbite.