Examines the mining history and geological characteristics of the three secondary sapphire deposits in the state of Montana, as well as the properties of these sapphires (unheated and heat-treated).

Two pearls from Bahrain containing minute shells are examined at GIA’s Mumbai laboratory.

An overview of the 2023 Tucson gem shows.

GIA’s Mumbai laboratory reports on pearl samples from a culturing experiment by the Suwaidi Pearl Farm in the UAE.

Examination of a gem-quality aquamarine crystal reveals an inclusion cluster presumed to be columbite.

Evaluates the growth mechanisms of special morphological features in Colombian emerald, including possible relationships to trapiche emeralds and samples displaying the gota de aceite effect.

A look at the largest CVD diamond GIA has encountered to date.

GIA is adding a report comment employing the trade color term “Peacock” for designated colors of cultured pearls from the Pinctada margaritifera black-lipped pearl oyster, commonly known as Tahitian pearls.

GIA is adding a report comment employing the trade color term “Peacock” for designated colors of cultured pearls from the Pinctada margaritifera black-lipped pearl oyster, commonly known as Tahitian pearls.

GIA’s industry-leading and globally-recognized diploma and certificate programs educate professionals with the skills needed for success in the gem and jewelry industry.

GIA will return to producing printed GIA Diamond Dossier reports beginning April 9.

GIA will return to producing printed GIA Diamond Dossier reports beginning April 9.

As a leading educational institute, GIA helps educate the next generation of gem and jewelry professionals in gemology, jewelry design and jewelry manufacturing arts.