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

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.

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

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.

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

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

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

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

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

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

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

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

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

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

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.