Black and dark gray diamonds from Siberia, Russia, were studied by analytical scanning and transmission electron microscopy.

The stories behind seven strikingly beautiful rare natural diamonds, united in an exhibit at the Smithsonian, are told here.

The heat treatment of corundum involving lattice diffusion of beryllium (Be) at temperatures over 1800°C has become a major issue in the gem trade.

Gemological, chemical, and spectroscopic properties are presented for the first known transparent faceted grandidierite.

Just because you don’t see it, doesn’t mean it isn’t there. Many areas in the jewelry industry—education, gemological research, lecturing, publication, and laboratory and inventory documentation, to name a few—either require or benefit from high-quality photomicrography.

The rare borosilicate poudretteite, a mineral that previously had been identified only as tiny crystals.

High-quality synthetic diamonds created by the Gemesis Corp. are examined and their gemological properties are explicated.

This chart combines a comprehensive listing of the commercially available treatments for the most commonly used gem materials with an indication of the current status of their detectability.

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.

This article chronicles the discovery of primary diamond deposits throughout Canada, whose increasing supply of rough stones will have a growing impact on the world diamond industry.

A relatively new production of red corundum, reportedly from Bangkok, has been offered for sale in recent years.

Known for their great beauty and rarity, pink diamonds have long been sought after by jewelers, collectors, and consumers.

Although the Pinctada margaritifera oyster usually is associated with the black pearls cultured in French Polynesia, it also can produce attractive large yellow cultured pearls, among other colors.

This article presents the first complete gemological characterization of the historic 128.48 ct Brazilian diamond known as the Star of the South.

Liddicoatite, a calcium-rich lithium tourmaline, was recognized as a separate mineral species in 1977, and named in honor of Richard T. Liddicoat.

Buying gems or jewelry can be challenging even when one has access to a fully equipped lab.

On this occasion—the celebration of Richard T. Liddicoat’s 50 years guiding Gems & Gemology—it is fitting to review his enormous impact on the field of gemology.

Jewelry designer Paula Crevoshay showcases the work of some of North America’s leading lapidaries.

For most of the 20th century, the principal source of fine spessartine was the area around the Little Three mine near the town of Ramona in southern California.

Vivid blue, green, and purple-to-violet cuprian elbaites, renowned in the gem trade as “Paraíba” tourmalines, continue to be recovered in small amounts from northeastern Brazil.