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

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

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.

GIA’s Hong Kong laboratory looks at a new radio-frequency identification (RFID) technology for tracking cultured pearls.

On February 5, 2020, Gems & Gemology launched a Facebook group dedicated to gemology and research published in the journal.

Inclusions resembling snowflakes, and hues of many colors, are two characteristics seen in fine-quality jadeite specimens on offer at the Tucson gem show.

Picturesque beaches and lush green jungles are not the only attractions that make Bali the most popular tourist destination in Indonesia.

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.

Untreated Russian emeralds, rarely seen in the market, demonstrate a range of color and degree of fineness.

Mina Stones promotes Nigerian gems including rubellite and sapphire as well as reviving traditional skills and symbols in the creation of original jewelry.

A delicate, ethereal necklace depicting a diamond butterfly caught in a gem-studded spider’s web won the third annual Gianmaria Buccellati Foundation student jewelry design contest.

Unusually large top-quality faceted Russian demantoid garnets with the characteristic lovely green to yellowish green color excite attention at the Tucson GJX show.

A rare Burmese star peridot cabochon is characterized by a soft four-rayed asterism and extremely fine acicular inclusions.

A transparent supply chain and the education of artisanal miners were two of the many topics discussed at Tucson’s first Ethical Gem Fair.

Green nephrite deposits are found at many locations around the globe, with British Columbia, Siberia, and northwestern China as the leading producers.

Advanced analytic techniques are critical for separating Ethiopian feldspar from Oregonian and copper-bearing feldspar with undetermined color origin.

Chrysocolla-in-chalcedony, also known as gem silica or blue chalcedony in Taiwan, is the most valuable chalcedony variety on the Taiwanese market.

The Bangkok laboratory recently examined a pearl containing a laminated shell bead nucleus with mysterious properties.