Violent kimberlite eruptions impact the surface features of diamonds, which can give scientists useful information about how diamonds react with the fluids in the mantle.

Numerous needle-like inclusions exhibit vibrant interference colors in a suite of pallasitic peridot from the Jepara meteorite.

Orange crystal inclusion identified as the rare mineral triplite in a beryl from Pakistan.

Application of slight pressure perpendicular to the twinning planes reveals the unusual property of this synthetic gem.

A ring made entirely of natural diamond was recently submitted to GIA’s New York laboratory.

Diamond formed at incredible depth shows evidence of radioactive fluids in cavities surrounded by green fluorescence halos.

A phenomenon resembling play-of-color was seen in a 4.13 ct unheated sapphire recently examined by the author.

The Hong Kong laboratory recently examined a Burmese star ruby incorporating a significant amount of bismuth glass.

Discusses the features of alkali elements and their influence on the color of blue to yellow beryl.

Chronicles developments at the Chivor emerald mine in Colombia between 1880 and 1925, based on archival records.

Presents a quantitative means of determining the causes of color in a gem material, using corundum’s six major chromophores as an illustration.

Explores the art form of jade carving in China across five periods from the late Neolithic Age to the present day.

Investigates the chemical, physical, and gemological properties of attractive rhodonite-rich rocks from this Swiss deposit.

A freely moving diamond crystal completely enclosed in a diamond from Siberia gets its name from the famous Russian nesting dolls.

Diamond inclusions are relatively common guests in diamond crystals.

The unusual six-rayed trapiche pattern, identified mainly with Muzo emeralds, has also been discovered in Mogok sapphires and Mong Hsu rubies.

A nondestructive rapid screening technique uses fluorescence spectroscopy to identify treated colored pearls.