Examination of a 0.40 ct near-colorless round brilliant diamond with a large inclusion resembling a dumbbell

The author examined a 0.56 ct Fancy grayish bluish green diamond with prominent green radiation stains.

The surprising inner world of inorganic inclusions in amber is explored through the use of polarized light and microscopic techniques.

A spinel from Madagascar, mixed in with a parcel of blue sapphire, exhibited an array of internal features.

Uses gamma-ray spectrometry to directly measure internal radioactivity in green nephrite from deposits in Poland, Russia, Canada, and New Zealand.

The author acquired an alluvial rough diamond from Guyana showing unique surficial features that do not appear to have been documented elsewhere.

Presents a simplified but comprehensive classification of gem tourmaline species based on quantitative measurement of six common major elements.

A report from the 34th IGC, held in Vilnius, Lithuania in August 2015.

The Stayish mine in Ethiopia’s Wollo province has been producing black opal since 2013.

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

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 summary of “The Ethics of Jewelry” panel, held at New York’s Metropolitan Museum of Art on January 25, 2019.

Provides a visual guide to the internal features of natural, treated, synthetic, and imitation opal.

The finale of a two-part series on the mining history of Austrian emerald deposits in the Habachtal region.

Characterizes yellow topaz from this historical source, with particular emphasis on its photo luminescence behavior.

160 ct yellow sapphire rough from Sri Lanka.

The author recently examined a 3.58 ct yellowish green yttrium aluminum garnet, a manufactured product known in the trade as “YAG,” that contained numerous large flux-filled fractures.

Located about 60 miles east of San Diego, a new emerald deposit has been discovered in the Julian Mining District.