A fascinating diamond crystal inclusion displaying a transparent, ghost-like appearance is identified in a Faint green diamond.

Two impressive diamonds from Arkansas and Colorado are featured in the Great American Diamonds exhibit at the Smithsonian’s National Museum of Natural History.

Discusses the unusual surface characteristics of ekanite from secondary deposits in Sri Lanka.

Rare optical phenomenon observed in four star quartz cabochons from Brazil.

An examination of 45 gems from the coronation crown of Napoleon III, using nondestructive mobile spectroscopic and gemological testing methods.

A glimpse at the rare gems recently on display at the Natural History Museum of Los Angeles County’s Brilliance: The Art and Science of Rare Jewels exhibit.

A lab in Bangkok shares study on color stability in yellow sapphire.

The historic discovery of a Maine tourmaline source is celebrated through jewelry designs featuring gems unearthed 50 years ago.

Unique natural etch pattern and dissolution cavities are observed in a large aquamarine crystal.

At the AGTA show, Rod and Nathaniel Cook of Washington Jade (Edmonds, Washington) told us about shifting their focus to cat’s-eye blue and bluish green nephrite jade.

The first installment of this column explores the potential role of modern-day deep-focus earthquakes on diamond growth.

Sellers and buyers alike were delighted to be back at Tucson for the show season after a two-year absence.